2010-2012迷你博客

XiaJing: MySQLdb.escape_string(...) escape_string(s) -- quote any SQL-interpreted characters in string s. 回复

(13小时前)
XiaJing: 公告：****个人空间即将改版.特别提醒：新版个人空间将不再提供迷你博客功能. 回复

(19小时前)
1. f3229189: (19小时前) 回复
XiaJing: Linux: mysql> select load_file('/tmp/file')； The return value is null. solution:change the owner of file. 回复

(02-15 18:31)
XiaJing: google还是总连不上。回复

(02-15 18:22)
1. XiaJing: (02-15 18:25) 回复
XiaJing: VirtualEnv 安装Numpy： ccompiler.py", line 44, in customize_compiler cpp = cc + " -E" # not alwaysTypeError: unsupported operand type(s) for +: 'NoneType' and 'str' 回复

(02-13 15:08)
1. XiaJing: solution:http://mail.scipy.org/pipermail/numpy-discussion/2011-June/056544.html (02-13 15:08) 回复
2. XiaJing: 问题环境：./easy_install numpy==1.5.1 (02-13 15:10) 回复
3. XiaJing: mkdir $VIRTUAL_ENV/local ln -s $VIRTUAL_ENV/lib $VIRTUAL_ENV/local/lib Install Numpy (02-13 15:12) 回复
XiaJing: pylons:../bin/paster controller helloCommand 'controller' not known (you may need to run setup.py egg_info). When running "paster controller", the current directory should be your Pylo 回复

(02-12 23:11)
1. XiaJing: http://groups.google.com/group/pylons-discuss/browse_thread/thread/367eaee969b13d70 (02-12 23:12) 回复
XiaJing: linux ocr: gocr(支持png) , ocrad(不支持png)和Tesseract(只支持depth<8的tif格式, convert -depth 8 f.png f.tif )。回复

(02-11 19:59)
XiaJing: cheese, libcheese, gstreamer, gstreamer0.10-tools, gst-inspect-0.10, http:/ /gstreamer.freedesktop.org/ 回复

(02-10 23:02)
XiaJing: v4l2 homepage www.linuxtv.org/downloads/ 回复

(02-10 21:01)
XiaJing: ffmpeg -t 10 -f video4linux2 -s 320x240 -r 30 -i /dev/video0 -f oss -i /dev/dsp1 -f mp4 webcam.mp4。回复

(02-10 20:25)
XiaJing: grep -ir --include=*.html PATTERN ./ 只查找html文档回复

(02-10 11:10)
1. qinchuan911: 有考虑换工作的意向吗？--猎头Morphy,QQ:2604420871 (02-10 11:54) 回复
XiaJing: $svnadmin create ./repo$svn import --depth=files ./ file:///home/xiajing/../.../repo/$svn checkout file:///home/xiajing/../.../repo/ ./$svn add file.txt$svn up file.txt$svn commit ./file.txt 回复

(01-02 10:49)
XiaJing: $svn commit ./file.txtAdding file.txtsvn: Commit failed (details follow):svn: File already exists: filesystem '/......../repo/db', transaction '1-4', path '/file.txt'$svn up file.txt 回复

(01-02 10:43)
XiaJing: TeXstudio 2.2 在 wizards->quick start后，原先输入的中文会变成问号，严重的问题。回复

(01-01 11:05)
1. XiaJing: 使用svn备份，但结果是乱码。 (01-01 11:35) 回复

2011年迷你博客

XiaJing: PDFCreator is a free tool to create PDF files from nearly any Windows application. 回复

(12-28 19:36)
XiaJing: unzip -O CP936 xxxx.zip 回复

(12-28 10:28)
1. XiaJing: zipinfo -v xxxx.zip (12-28 13:09) 回复
2. XiaJing: Code page is another term for character encoding. It consists of a table of values that describes the character set for a particular language. (12-28 13:21) 回复
3. XiaJing: Code page 936 is Microsoft's character encoding for simplified Chinese, one of the four DBCSs for East Asian languages. (12-28 13:22) 回复
4. XiaJing: Originally it was identical to GB 2312, and expanded to cover most part of GBK with the release of Windows 95; now superseded by Code page 54936 (GB 18030). (12-28 13:23) 回复
XiaJing: LabVIEWTMGetting Started with LabVIEWGetting Started with LabVIEWJune 2010373427G-01 National Instruments 回复

(12-27 23:50)
XiaJing: grep : --include=GLOB Search only files whose base name matches GLOB (using wildcard matching as described under --exclude). 回复

(12-27 10:30)
XiaJing: How to Unclog a Blocked Kitchen Sink.Pour the vinegar and baking soda down the kitchen sink.Rinse down the vinegar and baking soda. www.usaplumbing.info/tips/how-to-unclog-a-blocked-kitchen-sink 回复

(12-24 11:28)
XiaJing: numpy:a=np.array([]) b=np.arange(3) np.append(a,[b],0) ValueError: arrays must have same number of dimensions 回复

(12-23 13:10)
1. XiaJing: a=np.zeros([0,3]) b=np.arange(3) np.append(a,[b],0) (12-23 13:16) 回复

559 1 2 3 4 5 ›› ... 28

XiaJing: ****的信誉已经降到最低，信誉的提升不是靠删贴可以提升的。回复

(12-23 10:09)
XiaJing: ****有6428632个用户的密码和邮箱被公开，****是有过错的，是有不可推卸的责任的。回复

(12-23 10:04)
1. XiaJing: 亲爱的用户 xxxxxxxxxx：您好！您于2011年12月22日修改了您的密码，请谨记您的新密码。如果忘记了密码，请使用以下链接重置密码：http://passport.csdn.net/account/forgotpassword (12-23 10:06) 回复
2. sunriseyuen: ****太垃圾了,如何注销这里的帐号呢? (12-23 10:09) 回复
3. XiaJing: 从一开始，我就一直在备份在****上写的东西，看来就应该这样，****有过错，还是希望他能够及时改正吧。 (12-23 10:13) 回复
XiaJing: python: ["%i" %n for n in list] convert each element of list to string. 回复

(12-21 23:21)
XiaJing: simulink Simulation Accelerator, build error, cc1: /matlabxxxxx/sys/os/glnx86/libstdc++.so.6: version `GLIBCXX_3.4.14' not found (required by /usr/lib/libppl_c.so.2) 回复

(12-16 12:06)
1. XiaJing: substitude /matlabxxxxx/sys/os/glnx86/libstdc++.so.6 with the one link to /usr/lib/i386-linux-gnu/libstdc++.so.6.0.14 (12-16 12:08) 回复
XiaJing: ffmpeg -codecs Show available codecs.ffmpeg -i f1.wav -acodec pcm_xxx f2.avi 回复

(12-16 11:18)
XiaJing: ls: -s, --size print the allocated size of each file, in blocks. The total xxx displayed at the first line after execute ls -l command is the total blocks sizes allocated to each file and folder. 回复

(12-14 11:03)
1. XiaJing: ext4:each file is allocated multiples of 4KiBs. (12-14 11:20) 回复
XiaJing: Python recommends UpperCamelCase for class names, CAPITALIZED_WITH_UNDERSCORES for constants, and lowercase_separated_by_underscores for other names. www.python.org/dev/peps/pep-0008/ 回复

(12-13 21:34)
XiaJing: 琉球王国从明朝初年开始曾经是中国的藩属国，前后有500年。日本曾经多次想并吞琉球，未能得逞。甲午战争以后，*被割让，琉球也被日本占领。但日本对琉球的占领，从无法律依据。*媒体明确表态琉球群岛不属日本回复

(12-11 19:11)
1. sky3008: 实际占领多少年。。。。 (12-11 19:12) 回复
XiaJing: Kao-Cheng Huang, Zhaocheng Wang, "Millimeter Wave Communication Systems" 回复

(12-11 18:09)
1. XiaJing: Digital Signal Processing in Communication Systems Author: Marvin E. Frerking (12-11 18:09) 回复
XiaJing: eyeD3 - displays and manipulates id3-tags on mp3 files.ID3 is a metadata container most often used in conjunction with the MP3 audio file format. It allows information such as the title, artist, album 回复

(12-11 13:04)
1. XiaJing: eyeD3 --remove-images Remove all image (APIC) frames from the tag. (12-11 13:08) 回复
2. XiaJing: -v, --verbose Show all available tag information. (12-11 13:09) 回复
3. XiaJing: eyeD3 depends on python-eyed3 module (12-11 13:14) 回复
4. XiaJing: f=/usr/bin/eyeD3 ;file $f ; wc $f /usr/bin/eyeD3: a python script text executable 1229 3919 49196 /usr/bin/eyeD3 (12-11 13:20) 回复
XiaJing: MMVARI is a multi-Mode SoundCard Ham (Amateur) Radio program for receiving and transmitting the RTTY-PSK-FSK-MFSK modes. The program was written to experiment with the efficiency of transmitting Japan 回复

(12-10 17:36)
1. XiaJing: The program was written to experiment with the efficiency of transmitting Japanese and East Asian languages (HL/BV/BY) using the VARICODE. Eastern Asia languages, such as Japanese, Hangul, and Chinese (12-10 17:37) 回复
XiaJing: ubuntu matlab simulink dsp sink audio device :To select or change the Audio Hardware API, select Preferences from the MATLAB File menu. Then select DSP System Toolbox from the tree menu. 回复

(12-09 23:51)
1. XiaJing: help/toolbox/dsp/ref/toaudiodevice.html (12-09 23:51) 回复
XiaJing: An amateur radio contact, more commonly referred to as simply a "contact", is an exchange of information between two amateur radio stations. __en.wikipedia 回复

(12-09 22:58)
XiaJing: Fedora Draft DocumentationAmateur Radio GuideA guide for users of Fedora amateur radio software 回复

(12-09 15:23)
XiaJing: fldigi - digital modem program for hamradio operators 回复

(12-09 15:00)
XiaJing: arecord, aplay - command-line sound recorder and player for ALSA sound‐ card driver .-l, --list-devices List all soundcards and digital audio devices 回复

(12-09 13:54)
XiaJing: VBoxManage clonehd orig.vdi new.vdi 回复

(12-09 13:28)
XiaJing: PSK31 or "Phase Shift Keying, 31 Baud" is a digital radio modulation mode, used primarily in the amateur radio field to conduct real-time keyboard-to-keyboard informal text chat between amat 回复

(12-09 10:57)
1. XiaJing: linpsk - amateur radio PSK31/RTTY program via soundcard (12-09 15:01) 回复
XiaJing: ubuntu : use $crontab -e to edit command table and execute periodically. the table located in /var/spool/cron/crontabs/$USERNAME has the format : minute, hour, day, month, week command(script) 回复

(12-07 11:21)
1. XiaJing: “ */5 * * * * touch file” touch the file every 5 minutes. (12-07 12:00) 回复
XiaJing: /etc/initramfs-tools/modules :# List of modules that you want to include in your initramfs.# They will be loaded at boot time in the order below.# Syntax: module_name [args ...]# You must run updat 回复

(12-06 22:54)
1. XiaJing: # You must run update-initramfs(8) to effect this change. (12-06 22:55) 回复
2. XiaJing: update-initramfs -v -u -k `uname -r` ;initrd - boot loader initialized RAM disk (12-06 22:59) 回复
3. XiaJing: # /etc/modules: kernel modules to load at boot time. (12-07 09:04) 回复

559 ‹‹ 1 2 3 4 5 ›› ... 28

XiaJing: lsmod is a trivial program which nicely formats the contents of the /proc/modules, 回复

(12-06 22:51)
XiaJing: modprobe -l 基本等同于locate --regex "\.ko$" | sed "s/\/lib\/modules\/$(uname -r)\///" 回复

(12-06 22:28)
1. XiaJing: 以及 find "/lib/modules/$(uname -r)" -iname "*.ko" (12-06 22:32) 回复
XiaJing: The update-initramfs script manages your initramfs images on your local box. It keeps track of the existing initramfs archives in /boot. 回复

(12-06 22:02)
1. XiaJing: depmod - program to generate modules.dep and map files. (12-06 22:04) 回复
2. XiaJing: depmod -ae (12-06 22:04) 回复
XiaJing: Conversion among different wav file. ~$sox inputfile -e sig outputfile , ~$ffmpeg -i input.wav output.wav 回复

(12-05 14:56)
XiaJing: 0 (0x0000) Unknown ,1 (0x0001) PCM/uncompressed,2 (0x0002) Microsoft ADPCM,6 (0x0006) ITU G.711 a-law7 (0x0007) ITU G.711 Âµ-law17 (0x0011) IMA ADPCM20 (0x0016) ITU G.723 ADPCM (Yamaha) 回复

(12-05 13:21)
1. XiaJing: 49 (0x0031) GSM 6.10 64 (0x0040) ITU G.721 ADPCM 80 (0x0050) MPEG 65,536 (0xFFFF) Experimental (12-05 13:22) 回复
2. XiaJing: wav file format: Compression Code:offset0x14 (12-05 13:28) 回复
XiaJing: wav file format: www-mmsp.ece.mcgill.ca/Documents/AudioFormats/WAVE/WAVE.html, www.sonicspot.com/guide/wavefiles.html , 回复

(12-05 13:07)
XiaJing: python:import alsaaudio o = alsaaudio.PCM(alsaaudio.PCM_PLAYBACK, card='default') o.setchannels(1) out.setrate(44100) o.setformat(alsaaudio.PCM_FORMAT_S16_LE) o.setperiodsize(160) o.write('\x08\x00') 回复

(12-04 22:49)
XiaJing: FreeFem++-cs is an integrated environment for FreeFem++ (a C++-like computer language dedicated to the finite element method, developed under the supervision of profs Olivier Pironneau and Frédéric 回复

(12-03 10:49)
XiaJing: Elmer is an open source multiphysical simulation software developed by CSC - IT Center for Science (CSC). Elmer development was started 1995 in collaboration with Finnish Universities, research instit 回复

(12-03 10:48)
XiaJing: usrp NCO synchronization ? 回复

(12-02 22:25)
1. XiaJing: www.ti.rwth-aachen.de/teaching/ (12-02 22:26) 回复
2. XiaJing: Labs200910_Implementing an OFDM Transceiver by Software Defined Radio.pdf (12-02 22:27) 回复
3. XiaJing: lists.gnu.org/archive/html/discuss-gnuradio/2010-10/msg00088.html (12-02 22:29) 回复
4. XiaJing: A GNU Radio Based Software-Defined Radar Patton, Lee K. (12-03 00:27) 回复
XiaJing: "source" is the bash SHELL BUILTIN COMMANDS, 语法:source filename [arguments] Read and execute commands from filename in the current shell environment and return the exit status 回复

(11-29 19:10)
1. XiaJing: return the exit status of the last command executed from filename. (11-29 19:10) 回复
XiaJing: the mount point of iso file opened with Archive Mounter is in the ~/.gvfs directory. 回复

(11-29 18:44)
XiaJing: i3 390M , linux下, g++4.5 , c++程序， 128阶FIR, 每秒输出1,600,000个采样。回复

(11-28 22:14)
1. XiaJing: 如果使用Intel C++ Compiler （2011_sp1.7.256），最快每秒输出54,000,000个采样 (11-29 23:02) 回复
2. XiaJing: icpc (11-30 22:22) 回复
XiaJing: Why can't I change the permissions, create, or delete folders in the Shared With Me folder?The Ubuntu One/Shared With Me folder is a special folder that holds all the folders other Ubuntu One users 回复

(11-27 11:34)
1. XiaJing: other Ubuntu One users share with you. If someone shares a folder with you and makes that share writeable, you should be able to read, write and delete files from that folder. You cannot modify or del (11-27 11:35) 回复
2. XiaJing: . You cannot modify or delete folders directly in the Ubuntu One/Shared With Me folder. (11-27 11:36) 回复
XiaJing: find - search for files in a directory hierarchy.eg.find -name *.py -ctime +20, +n for greater than n, -n for less than n, n for exactly n. 回复

(11-26 20:42)
XiaJing: IDL is vectorized, numerical, interactive, and is commonly used for interactive processing of large amounts of data (including image processing). There is a free implementation, GNU Data Languag(GDL 回复

(11-26 16:19)
XiaJing: Introduction to phase-locked loopsystem modelingBy Wen Li, Senior System Engineer, Advanced Analog Product Groupand Jason Meiners, Design Manager, Mixed-Signal Product Group 回复

(11-25 22:25)
XiaJing: Write binary file in matlab:d2=randn(2,2,2); fid = fopen('xxxx.bin' , 'w');fwrite(fid, d2,'double');fclose(fid); 回复

(11-23 18:22)
XiaJing: Read binary file with python:import structwith open('xxxxx.bin', 'r') as f:strdata = f.read()f.closeddbldata= struct.unpack("d", strdata[0:8]) 回复

(11-23 18:19)
1. XiaJing: input: numpy.fromstring('\xff\xff\x00\x80',dtype=numpy.int16) output: array([ -1, -32768], dtype=int16) (12-05 16:09) 回复
XiaJing: 3D Vector Graphics. pstricks, metapost 回复

(11-22 23:57)

559 ‹‹ 1 2 3 4 5 ›› ... 28

XiaJing: ubuntu natty : matlab ,python.math, python.numpy: floor(3.9999999999999999999999999999999999)=4, 回复

(11-22 20:48)
XiaJing: Quadrature Signals: Complex, But Not Complicated by Richard Lyons http:/ /www.dspguru.com/sites/dspguru/files/QuadSignals.pdf 回复

(11-22 00:14)
XiaJing: 对已有的位图进行标注。回复

(11-21 14:49)
XiaJing: install oss-compatoss4-baseoss4-dkms 回复

(11-20 16:48)
XiaJing: 1 Executable programs or shell commands 2 System calls (functions provided by the kernel) 3 Library calls (functions within program libraries) 4 Special files (usually fou 回复

(11-20 14:04)
1. XiaJing: 4 Special files (usually found in /dev) 5 File formats and conventions eg /etc/passwd 6 Games 7 Miscellaneous (including macro packages and conven‐ tions), (11-20 14:05) 回复
2. XiaJing: 7 Miscellaneous (including macro packages and conven‐ tions), e.g. man(7), groff(7) 8 System administration commands (usually only for root) 9 Kernel routines [Non s (11-20 14:05) 回复
3. XiaJing: 9 Kernel routines [Non standard] (11-20 14:06) 回复
XiaJing: Automated RF Techniques Group (ARFTG).ARFTG is a technical organization interested in all aspects of RF and Microwave test and measurement. 回复

(11-19 22:45)
XiaJing: The GHex program can view and edit files in two ways, hex or ascii. 回复

(11-18 20:45)
XiaJing: ImportError: libgnuradio-core-3.4.2.so.0: cannot open shared object file: No such file or directory. 解决：export LD_LIBRARY_PATH=/usr/local/lib export PYTHONPATH=/usr/local/lib/python2.7/dist-packages 回复

(11-18 00:06)
XiaJing: The Comedi project develops open-source drivers, tools, and libraries for data acquisition. http:/ /www.comedi.org/ 回复

(11-17 22:21)
XiaJing: nmap - Network exploration tool and security / port scanner 回复

(11-17 11:23)
XiaJing: 使用vnc，启动gedit在键入d时窗口消失，再按d键又出现，无法输入d。gconf-editor->apps->metacity->global_keybingdings->show_desktop->super+d 更改为disabled。回复

(11-16 23:36)
1. XiaJing: http:/ /topic.****.net/u/20111025/09/79cfc65c-fdb6-4aed-adc8-bf240d7c3e58.html (11-16 23:38) 回复
XiaJing: ubuntu natty narwhal :vnc4server和vnc-java是两个包，只安前者无5800+display num端口，只有5900+display num端口。安装后者后可在浏览器中使用VNC。回复

(11-16 23:27)
XiaJing: vnc4server, $vncserver Creating default startup script /home/xiajing/.vnc/xstartupStarting applications specified in /home/xiajing/.vnc/xstartupLog file is /home/xiajing/.vnc/xiajing-xx:1.log 回复

(11-16 12:55)
1. XiaJing: vncserver -kill :1 (11-16 13:03) 回复
XiaJing: solaris.vnc, http:/ /blogs.oracle.com/timthomas/entry/script_to_configure_vnc_server ; vinagre - a remote desktop viewer for the GNOME Desktop。vinagre [OPTIONS] [server][::port|:display] 回复

(11-15 17:04)
1. XiaJing: ubuntu,vinagre:Applications->Internet->Remote Desktop Viewer (11-16 09:36) 回复
XiaJing: solaris.pkginfo - display software package information. Without options, pkginfo lists the primary category, package instance, and the names of all completely installed and partially installed package 回复

(11-15 11:00)
1. XiaJing: pkginfo | grep vnc (11-15 11:01) 回复
2. XiaJing: system SUNWvncviewer VNC viewer client (11-15 11:02) 回复
3. XiaJing: system SUNWxvnc X11/VNC server (11-15 11:02) 回复
XiaJing: asymptote :lift , guide3[][] lift(real f(real x, real y), guide[ ][ ] g, interpolate3 join=operator --) 回复

(11-14 10:26)
XiaJing: enscript - convert text files to PostScript, HTML, RTF, ANSI, and overstrikes。enscript --help-highlight 。enscript --language=html --highlight=java xxx.txt -o xxx.html 回复

(11-13 19:13)
1. XiaJing: Highlight - a universal sourcecode to formatted text converter (11-13 20:55) 回复
XiaJing: asymptote: asy -f svg xxx.asy , 需要编译安装dvisvgm。回复

(11-12 22:42)
XiaJing: asymptote:currentlight=light(gray(0.25),(0.0,1.0,0),(0,0,1),(1,1,0)); 光线强度、角度及个数。回复

(11-12 21:23)
XiaJing: linux. pi - compute decimal Archimedes' constant Pi to arbitrary accuracy.Super PI is a computer program that calculates pi to a specified number of digits after the decimal point—up to a maximu 回复

(11-09 23:31)

559 1 ... ‹‹ 2 3 4 5 6 ›› ... 28

XiaJing: history和tab completion跟shell有关，bash具有此功能，尤其是在solaris等unix系统，bash不是缺省的shell，所以这中情况没有history和tab completion，这不是solaris的责任。回复

(11-08 23:17)
XiaJing: xchm - Compiled HTML Help (CHM) file viewer for X. 回复

(11-08 19:09)
XiaJing: linux distribution: Red Hat Enterprise Linux-based:Scientific Linux , centos 回复

(11-08 17:28)
XiaJing: xmanager remote login solaris 10(u10): svcadm disable cde-login ; /etc/X11/gdm/gdm.conf 中[xdmcp] Enable=true; Port=177;svcadm enable svc:/application/gdm2-login:default; 回复

(11-07 21:42)
1. XiaJing: Xnest -query 192.168.1.xxx :2 (11-07 21:58) 回复
2. XiaJing: Not on system console, root login rejected Edit /etc/default/login and comment out the following line. # CONSOLE=/dev/console (11-07 22:24) 回复
XiaJing: tsclient is a GNOME program for remotely accessing Microsoft Windows NT/2000Terminal Services and XP Remote Desktop Sharing as implemented by the RemoteDesktop Protocol (RDP). Using the rdesktop pro 回复

(11-07 19:47)
XiaJing: remote gdm. Xnest is an X Window System server that shows its output in a window. 回复

(11-06 14:41)
XiaJing: wallpaper :http:/ /photography.nationalgeographic.com/photography/photo-of-the-day/landscapes/?page=4 回复

(11-05 22:36)
XiaJing: checksum: md5 32*4=128 bits sha1sum 40*4=160 bits 回复

(11-05 17:06)
XiaJing: latex.floatflt.sty not found.http:/ /intertwingly.net/blog/2010/04/22/Restoring-floatflt-sty mkdir -p /usr/share/texmf-texlive/tex/latex/floatfltcd /usr/share/texmf-texlive/tex/latex/floatfltrm - 回复

(11-05 16:30)
1. XiaJing: rm -f floatflt.* float*.tex ; wget http://mirror.ctan.org/macros/latex/contrib/floatflt/floatflt.ins ; wget http://mirror.ctan.org/macros/latex/contrib/floatflt/floatflt.dtx ; latex floatflt.ins ; t (11-05 16:32) 回复
2. XiaJing: texhash /usr/share/texmf-texlive (11-05 16:32) 回复
3. XiaJing: floatflt has an unusual license which has been deemed unfree. (11-05 16:33) 回复
XiaJing: linux。hardinfo - shows hardware information in a GTK+ window。回复

(11-01 22:32)
1. demo: nice (11-01 23:10) 回复
XiaJing: Wall-clock time, or wall time, is the human perception of the passage of time from the start to the completion of a task.墙上挂的钟。回复

(11-01 22:29)
XiaJing: linux。bc - An arbitrary precision calculator language。time - run programs and summarize system resource usage。time echo "scale=20000 ;sqrt(2)" | bc 。real 0m15.932suser 0m15.849ssys 0m0 回复

(11-01 22:13)
XiaJing: more /proc/cpuinfo more /proc/interrupts ; 回复

(11-01 21:45)
XiaJing: In Firefox 3.5 a triple-click selects the entire paragraph. 回复

(10-29 17:14)
XiaJing: asy 中， path p1=Circle((0,0),1,30);path p2=circle((0,0),1);write(size(p2));write(size(p1)); draw(p1)和draw(p2)是重合的，虽然p1的size为30,p2为4. 回复

(10-21 12:23)
1. XiaJing: Arc与arc绘制的弧也基本重合。即使半径很大。 (10-21 12:33) 回复
XiaJing: gv bug :Warning: translation table syntax error: Unknown keysym name: apLineDelWarning: ... found while parsing '<Key>apLineDel: GV_Page(page+5) 'Warning: String to TranslationTable 回复

(10-21 12:10)
1. XiaJing: 3.7.1有该bug。重新编译安装3.7.2消除。运行asy显示圆时出现的。 Ubuntu 11.04. (10-21 12:12) 回复
XiaJing: 三维消隐。两个平面A，B相交，既有A在前B在后，又有B在前A在后的时候。不透明时，交界明显。透明时交界不显示，即使设0.99不透明。因为显示的是两个平面颜色的叠加，不分前后。回复

(10-20 22:18)
XiaJing: There are four choices for viewing 3D Asymptote output:1.native Asymptote adaptive OpenGL-based renderer. 2.rasterized format(jpg,png). 3.Embed the 3D PRC format in a PDF file. 4.two-dimensional vecto 回复

(10-20 00:21)
1. XiaJing: 4.two-dimensional vector (EPS or PDF) format with render=0. (10-20 00:22) 回复
XiaJing: 3D geometry：Calques 3D 遵循GPL但使用MS的VC开发，只有windows版本。www.calques3d.org 回复

(10-19 10:12)
XiaJing: 梯度的理解。曲面可以分解为众多局部平面，考察曲面上某点的梯度可做该点的切面，以该点为圆心在切面上画圆形，圆上最高点到该点的有向线段为梯度方向。回复

(10-19 00:20)
1. XiaJing: 用平面的等高线分析。 (10-19 10:13) 回复

559 1 ... ‹‹ 3 4 5 6 7 ›› ... 28

XiaJing: asymptote.当asy -f pdf x.asy 提示错误：Error: /invalidfileaccess in --file--GPL Ghostscript 9.01: Unrecoverable error, exit code 1/usr/share/asymptote/plain_xasy.asy: 93.7: runtime: shipout failed 回复

(10-18 23:34)
1. XiaJing: 当前目录建立config.asy，内容为import settings; gsOptions="-P"; (10-18 23:36) 回复
2. XiaJing: http:/ /sourceforge.net/projects/asymptote/forums/forum/409349/topic/3915524 (10-18 23:36) 回复
XiaJing: MATPLOTLIB中类似matlab中axis equal和axis tight的命令是xax=plt.gca()xax.set_aspect(1,adjustable='box')plt.axis([0.8 ,1.5 ,-0.4 ,1]) 回复

(10-18 15:44)
1. XiaJing: xax.autoscale_view(tight=True) (10-18 15:49) 回复
XiaJing: texmakerx现在为texstudio，ubuntu下需要编译安装，natty narwhal 下编译后信息为：Using Qt Version 4.7.2, compiled with Qt 4.7.2 回复

(10-16 10:54)
1. XiaJing: texmaker依旧不好用。 (10-16 10:55) 回复
XiaJing: tex中，首页与其他页布局不同(如顶端不对齐)的原因是：首页中的\centering \fontsize将影响下一页，而首页前是按照缺省的\fontsize，所以首页开头也要设置\fontsize等参数。回复

(10-08 09:17)
XiaJing: ubuntu disk space: info coreutils 'df invocation' 回复

(09-30 23:21)
1. XiaJing: df: 对于根目录/ (Size-Used-Available)/Size*100%=5%(用tune2fs -m可调) free=Size-Used, Available=Size-Used-Size*5% 对于其他挂载的系统 Size-Used-Available=0，free=Size-Used, free=available, Available=Size- (09-30 23:56) 回复
2. XiaJing: 对于其他挂载的系统 Size-Used-Available=0，free=Size-Used, free=available, Available=Size-Used-Size*0% (09-30 23:57) 回复
3. XiaJing: df -i 用来检查有空间无i node的情况。 (10-01 00:08) 回复
XiaJing: convert -chop 120x100 -rotate 180 -chop 110x90 -rotate 180 -resize 500x375 *.png a3.gif 回复

(09-27 22:03)
XiaJing: 重复：相位是频率对时间的积分而不是乘积。如exp(j*beta*t*t). 回复

(09-13 22:12)
XiaJing: Linux CLI, stat - display file or file system status, stat -c %Y f1.txt, date +"%s" -r f1.txt .对于date, %s 指seconds since 1970-01-01 00:00:00 UTC。回复

(09-12 09:48)
XiaJing: Digital Transmission Engineering 定价：￥1,452.00 会员价：￥1,452.00 校园优惠价：￥1452(100折) 作者： John B. Anderson 出版社：Wiley, John & Sons, Incorporated ISBN：9780780334571 回复

(09-10 22:03)
1. XiaJing: Synchronization of Digital Telecommunications Networks (09-10 22:06) 回复
2. XiaJing: Digital Clocks for Synchronization and Communications (09-10 22:06) 回复
3. XiaJing: Digital Communication Receivers: Synchronization, Channel Estimation, and Signal Processing (Volume 2): Heinrich Meyr, Marc Moeneclaey, Stefan A. Fechtel Wiley-Interscience | (09-10 22:07) 回复
4. XiaJing: Synchronization in Wireless Sensor Networks: Parameter Estimation, Peformance Benchmarks, and Protocols (09-10 22:08) 回复
5. XiaJing: David J. Kinniment "Synchronization and Arbitration in Digital Systems" (09-10 22:08) 回复
XiaJing: sed -n '/href/{N;/\n.*汉字/p}' file 不起作用。sed -n '/href/{N;/\n.*englishword/p}' file 起作用。回复

(09-05 22:03)
1. XiaJing: line1 href line2 href line3 汉字 line4, 跟汉字无关，汉字出现在偶数个href的后面。 (09-05 22:09) 回复
2. XiaJing: sed -n '/汉字/{x;G;p};h' file#类似grep -B1 汉字 (09-05 22:22) 回复
XiaJing: arecord, aplay - command-line sound recorder and player for ALSA sound‐card driver 回复

(08-29 23:02)
1. XiaJing: help.ubuntu.com/community/SoundTroubleshooting (08-29 23:06) 回复
2. XiaJing: help.ubuntu.com/community/alsa-oss (08-29 23:06) 回复
XiaJing: Otherwise, numbers take the form [base#]n, where the optional base is a decimal number between 2 and 64 representing the arithmetic base, and n is a number in that base. 回复

(08-27 22:45)
1. XiaJing: bash manual (08-27 22:46) 回复
2. XiaJing: Strip the leading zeros of number. v=000110;echo $((10#$v)) (08-27 22:49) 回复
3. XiaJing: let w=”10#$v” (08-27 22:55) 回复
XiaJing: If the extglob shell option is enabled using the shopt builtin, several extended pattern matching operators are recognized. In the following description, a pattern-list is a list of one or mor 回复

(08-27 22:04)
1. XiaJing: *(pattern-list) Matches zero or more occurrences of the given patterns (08-27 22:06) 回复
2. XiaJing: Strip the leading zeros of number. v=000110;echo ${v##*(0)} (08-27 22:52) 回复
XiaJing: bash，删除数字前面的0，b=$(echo 0000100 | sed 's/^0*//');echo $b，这样0000000将为空(应该为0)，修改为b=$(echo 0000100 | sed 's/^0\{,4\}//');echo $b 回复

(08-27 17:43)
XiaJing: bash， ls -l | wc -l 实现当前文件夹下文件个数的计算（多一个，包括第一行total）。ls -1 | wc -l 不会多一个。回复

(08-27 15:26)
XiaJing: iconv实现GB18030到UTF-8的转换。回复

(08-27 01:20)
XiaJing: MldonkeyFox protocols Handler 0.13 不能解析文件名中有斜杠字符的链接。回复

(08-25 11:54)
1. XiaJing: 用sed把ed2k链接中的名字改一下就可以，ed2k是通过hash区分文件的而不是名字。 (08-25 12:14) 回复
XiaJing: Add line number to text , nl filename, cat -n filename , sed = filename | sed '{N;s/\n/./}' . 回复

(08-21 23:44)
XiaJing: sed 中找到最后一个匹配： sed '$s/$.*$XX.*/\1/'，主要用到parentheses。回复

(08-20 17:29)
XiaJing: sed 的RE 是 Greedy Match，不能实现在perl里可以实现的".*?XX"这种NonGreedy Match。解决的办法是找到第一XX替换成\n，然后删掉这一行。回复

(08-20 17:22)

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XiaJing: 用highlight命令将bash脚本转换为高亮显示的bbcode代码。highlight -Y -i **.sh， -Y为bbcode输出。回复

(08-20 17:15)
1. XiaJing: gvim 可以把source file convert to HTML。 (08-20 17:44) 回复
XiaJing: # delete all trailing blank lines at end of file sed -e :a -e '/^\n*$/{$d;N;ba' -e '}' # works on all seds 回复

(08-20 01:14)
XiaJing: 对于用amule下载的文件都有一个hash值或称为文件指纹，ed2k的hash基于md4算法(wiki.amule.org/index.php/MD4_hash)，验证下载的文件是否正确不能用md4校验程序(ubuntu里有md5sum,sha1sum,有openssl dgst -md4)。验证方法回复

(08-19 18:45)
1. XiaJing: 验证方法是将文件放在amule的共享目录内，从amule界面查看共享文件时将会显示FILEID，既Hash值，可与原始文件的Hash(含在ed2k的链接里)比较。 (08-19 18:45) 回复
XiaJing: 用CLI的mplayer时，用xdotool模拟键盘输入很有用，实现自动重复。如xdotool key Left模拟左箭头，即seek backward 10 seconds。回复

(08-19 16:40)
1. XiaJing: www.linuxquestions.org/questions/linux-desktop-74/bash-script-to-simulate-keyboard-entry-862060/ (08-19 16:43) 回复
XiaJing: man命令的使用类似vi，如查找，/pattern，用n前向查找下一个，N反向查找下一个。回复

(08-17 00:45)
XiaJing: ubuntu里的中文文件名的编码为UTF-8，也可以为GB18030但显示为乱码，不过如果放在ftp目录下，用firefox通过ftp看GB18030编码的文件名则会正确显示。但ipad2里的safari看的ftp里的中文都是问号。回复

(08-16 16:59)
XiaJing: 对于文本：Head 123456123789 。执行sed 's/^.*123//' xxx。将得到 789。类似bash中的${parameter##*123}而不是${parameter#*123}，即去掉最长匹配。回复

(08-16 15:35)
XiaJing: sed 好像不能处理GB18030编码的文本，但可以处理UTF-8的文本。对于GB18030编码的文本只需用gedit另存选utf-8编码就可。回复

(08-16 15:25)
1. XiaJing: 也不能说是sed不能处理，应该是term不支持显示GB18030编码的中文。 (08-19 16:45) 回复
XiaJing: ** (gedit:5488): CRITICAL **: _gedit_tab_save_as: assertion `encoding != NULL' failed保存时手动选编码如UTF-8 回复

(08-16 15:13)
XiaJing: url , percent encode decode,fnamepercent="%E8%BF%9E%E7%8E%AF%E7%94%BB" fnamecn=$(python -c "import urllib; print urllib.unquote(\"$fnamepercent\")") 回复

(08-15 15:32)
1. XiaJing: wget $furl --output-document=$fnamecn (08-15 15:34) 回复
XiaJing: ubuntu natty下realplayer10无声。安装alsa-oss,执行aoss realplay解决。回复

(08-14 21:28)
XiaJing: vim. 将xxx替换成换行符 :%s/xxx/^M/g，^M为CTRL-V CTRL-M。详见:h sub-replace-sepcial。回复

(08-08 00:01)
XiaJing: vim, how to comment multiple lines. (Enter command mode in VIM):2,5s/^/#/g , 在2到5行的开头插入注释符号#。 reference: www.pinoytux.com/linux/vim-trick-how-to-comment-multiple-lines 回复

(08-06 21:47)
1. XiaJing: uncomment用 :2,5s:^# 或 :2,5s:^#* (08-07 00:10) 回复
XiaJing: 设置chrome的proxy后，会产生环境变量如http_proxy，https_proxy等，这将影响wget的使用。回复

(08-05 10:32)
XiaJing: IPAD中用safari下载vsftpd中的rmvb文件，提示“下载失败 Safari无法下载此文件”，将rmvb更改为rm解决。原因是没有与rmvb关联的应用程序。即使安装了Oplayer等能够识别rm文件的应用程序。回复

(07-31 23:47)
1. XiaJing: 720X395分辨率视频声音同步没问题，虽然没有电脑流畅。 (07-31 23:59) 回复
XiaJing: Merriam-Webster's.Advanced.Learner's.English.Dictionary.prc可以用Mobipocket reader打开。回复

(07-31 23:00)
XiaJing: amule中有一项“last seen complete"的意思是shows the last time you've seen the entire file provided by the sources you've asked。回复

(07-31 22:27)
XiaJing: ubuntu11.04 用Arista Transcoder 0.9.6转换视频格式以适于ipad播放，提示不能找到GStreamer element x264enc，安转gstreamer0.10-plugins-ugly-multiverse解决，回复

(07-29 20:48)
XiaJing: 00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)01:00.0 VGA compatible controller: ATI Technologies Inc NI Seymour [AMD Radeon HD 6470M] (re 回复

(07-29 00:36)
1. XiaJing: lspci | grep -i vga (07-29 00:37) 回复
2. XiaJing: lspci -v -s 00:02.0 (07-29 00:38) 回复
3. XiaJing: www.cyberciti.biz/faq/howto-find-linux-vga-video-card-ram/ (07-29 00:38) 回复
XiaJing: baidu的逻辑搜索的非 “-” 不起作用。回复

(07-28 11:29)

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XiaJing: wiley Ubuntu® Linux® Toolbox:1000+ Commands for Ubuntu and Debian Power Users 2008 回复

(07-27 23:31)
XiaJing: motion, www.lavrsen.dk/foswiki/bin/view/Motion/WebHome 回复

(07-25 23:48)
XiaJing: 如果只是用CL收发邮件，如用MUTT，则选MTA时用postfix显得过于复杂，用msmtp就可以。回复

(07-25 20:07)
XiaJing: msmtp --host=smtp.126.com --serverinfoSMTP server at smtp.126.com (m50-112.126.com [123.125.50.112]), port 25: 126.com Anti-spam GT for Coremail System (126com[20101010])Capabilities: PIPELI 回复

(07-25 20:03)
1. XiaJing: AUTH: Supported authentication methods: PLAIN LOGIN (07-25 20:41) 回复
2. XiaJing: 不安全 (07-25 20:44) 回复
XiaJing: telnet smtp.126.com 25 回复

(07-25 00:23)
XiaJing: sudo dpkg-reconfigure postfix 回复

(07-24 23:46)
XiaJing: ubuntu下禁用touchpad, Run gconf-editor Edit the keys in the /desktop/gnome/peripherals/touchpad/ folder. https;//wiki.archlinux.org/index.php/Touchpad_Synaptics#Synaptics_Special_Ability 回复

(07-24 18:32)
XiaJing: Gnome, Ctrl+Alt+Tab Give focus to a panel. http;//library.gnome.org/users/gnome-access-guide/stable/keynav-5.html.en 回复

(07-24 18:00)
XiaJing: 用fbreader打开epub文件。回复

(07-24 12:21)
XiaJing: 关闭firefox的plugin-container。用top命令查看，plugin-container占用大量cup资源，副作用远大于作用。关闭方法：about:config, dom.ipc.plugins.enabled 设为false。回复

(07-24 11:09)
XiaJing: William von HagenUbuntu® Linux® BibleThird EditionFeaturing Ubuntu 10.04 LTS. 简评：桌面内容(图形界面)的操作占主要部分，CL的内容基本没有。回复

(07-24 10:02)
XiaJing: Gnutella 回复

(07-24 09:34)
XiaJing: The Macmillan Visual Dictionary 回复

(07-23 10:40)
XiaJing: 用GIMP制作1bit单色图形文件。首先color->threshold，然后Image->mode->indexed，弹出Indexed Color Conversion对话框，选1-bit palette。回复

(07-19 10:55)
1. XiaJing: Image Properties对话框里：Color space: Indexed color(2 colors)，一般是RGB或Grayscale (07-19 10:57) 回复
2. XiaJing: 5100 × 6600 pixels的图像,bmp灰度占32M，1bit占4M。若为png格式灰度占58k，1bit占18k。 (07-19 10:59) 回复
XiaJing: linux下的图形图像手工绘制处理软件，LibreOffice Draw，GIMP，Inkscape，Dia 回复

(07-19 10:16)
XiaJing: 为什么有些国产软件不够厚道。那时推出easymule时用了一次就删除了，还是用www.emule-project.net上的emule，刚才看到http;//emulefans.com/easymule2-alleged-plagiarism-from-amule/ 。回复

(07-18 00:07)
XiaJing: shell里打开GB18030编码的文本文件显示为乱码。待解决。回复

(07-17 23:36)
XiaJing: ~$ localeLANG=en_US.UTF-8LANGUAGE=en_US:enLC_CTYPE="en_US.UTF-8"LC_NUMERIC="en_US.UTF-8"LC_TIME="en_US.UTF-8"LC_COLLATE="en_US.UTF-8"LC_MONETARY="en 回复

(07-17 23:14)
XiaJing: ubuntu用gedit打开中文文本文档出现乱码。解决方法：gconf-editor程序->apps->gedit-2->preferences->encodings中auto_detected添加GB18030并置顶。回复

(07-17 23:11)
XiaJing: www.thegeekstuff.com/2008/08/15-examples-to-master-linux-command-line-history/ —— www.thegeekstuff.com/2009/03/15-practical-linux-find-command-examples/ 回复

(07-17 22:25)

559 1 ... ‹‹ 6 7 8 9 10 ›› ... 28

XiaJing: ubuntu11.04使用evince打开ps文件，然后打印到文件选择pdf格式，提示Failed to print document和Printing is not supported on this printer。替换办法：用ghostscript包里的ps2pdf程序。回复

(07-13 21:03)
XiaJing: matlab2011a/bin/util/oscheck.sh: 605: /lib/libc.so.6: not found _________________ libc6 Embedded GNU C Library: Shared libraries 回复

(07-13 20:11)
XiaJing: ngspice进行ac分析，结果通带是负值，阻带接近0，原因在于语句“V1 0 3 AC 1 180”中的1的正负，180度还是0度初相，0 3还是3 0，这三个地方都可改变极性。回复

(07-11 23:32)
1. XiaJing: ngspice>source xx.net ngspice>run ngspice>plot (07-11 23:35) 回复
XiaJing: 最近ZF对网站的fengsuo更严厉了，这种政策将会阻碍发展。回复

(07-11 20:11)
XiaJing: 找资料过程中用baidu搜中文网站的内容看是否有该资料，有一个方便下载该资料的网站居然没有列出，而google(偏好设置为中文)搜时该网站排在首页，顺利下载。以后中文网站也用google搜。回复

(07-11 20:02)
XiaJing: only the server versions of Mac OS X are designed to be used in a virtual environment; as a result, VirtualBox does not support client versions of Mac OS X as a guest. 回复

(07-10 14:48)
1. XiaJing: www.virtualbox.org/manual/ch03.html (07-10 14:48) 回复
2. XiaJing: VB4上安装Snow Leopard 10.6.7提示"still waiting for root device"，待解决。 (07-10 15:49) 回复
XiaJing: ubuntu下安装AcetoneISO用于将dmg文件转换成iso文件，但该功能在从ubuntu repositories 里安装AcetoneISO后需单独下载。回复

(07-10 14:19)
XiaJing: Virtual Box 4.0安装Snow Leopard，可以读取dmg镜像，运行时提示：VT-x/AMD-V hardware acceleration has been enabled, but is not operational. Certain guests (e.g. OS/2 and QNX) require this feature.Please ensur 回复

(07-10 12:17)
1. XiaJing: Please ensure that you have enabled VT-x/AMD-V properly in the BIOS of your host computer. (07-10 12:17) 回复
2. XiaJing: i3 390的cpu支持VT-x，natty narwhal系统或bios可能不支持，先在设置里关掉，待解决。。 (07-10 12:20) 回复
3. XiaJing: 该问题可通过在bios里enable Virtulization项解决。 (07-10 15:50) 回复
XiaJing: CompTIA :Computing Technology Industry Association . CompTIA Linux+™ 回复

(07-10 11:47)
XiaJing: Britannica Illustrated Science Library (16 Vol Set)Britannica Discovery Library (12-volume set) 回复

(07-10 09:15)
XiaJing: ubuntu: cksfv校验sfv文件的工具。\nxiaj@xjUbuntu:~/Downloads$ cksfv hxxxxxx.r03 回复

(07-09 21:21)
1. XiaJing: ; Generated by cksfv v1.3.14 on 2011-07-09 at 21:13.36 (07-09 21:22) 回复
2. XiaJing: hxxxxxx.r03 7C4FAC84 (07-09 21:22) 回复
3. XiaJing: cksfv is a tool for verifying CRC32 checksums of files. (07-09 21:35) 回复
4. XiaJing: Simple file verification (SFV) is a file format for storing CRC32 checksums of files to verify the integrity of files.————en.wikipedia.org (07-09 21:43) 回复
XiaJing: 在ubuntu 11.04+firefox 4下点击ed2k链接提示无应用程序关联。采取：about:config设置。wiki.amule.org/index.php/Ed2k_links_handling#Firefox_2_and_3_.28or_later.29 但无效。回复

(07-09 13:37)
1. XiaJing: 即network.protocol-handler.external.ed2k true (07-09 13:38) 回复
2. XiaJing: 和 network.protocol-handler.app.ed2k string /usr/bin/ed2k 或 ed2k (07-09 13:39) 回复
3. XiaJing: network.protocol-handler.expose.ed2k false (07-09 13:40) 回复
4. XiaJing: 按照wiki.amule.org的指示设置上面3个参数设置后，再安amule-gnome-support，但最终无效。 (07-09 13:42) 回复
5. XiaJing: 解决办法：安装firefox add-ons MldonkeyFox protocols Handler 0.13 by Wile (07-09 13:43) 回复
XiaJing: gedit,可以使用\n表示换行符，用\\n表示\n。这样在替换时很有用。回复

(07-09 10:03)
1. zjw850133152: 为什么这么说呢？难道你碰到相关的问题了？分享出来嘛，以便大家都能学习学习，共同进步。呵呵 (07-09 10:08) 回复
2. XiaJing: 好，举个例子，比如希望遇到 ">"字符换行，但原来的文件一行包含多个">“，这样就可以用”\n>“替换”>“ (07-09 13:29) 回复
XiaJing: RAR 4.00 beta 3 Copyright (c) 1993-2010 Alexander Roshal 17 Dec 2010Shareware version Type RAR -? for helpExtracting from /home/xiajing/t/t.rarNo files to extract文件名称为中文时有该问回复

(07-09 00:09)
1. XiaJing: 压缩文件名为中文导致File Roller 2.32.1的报错信息。 (07-09 00:10) 回复
2. XiaJing: 命令行下的rar：AUTHOR This manual page was written by Petr Cech <cech@debian.org> according to "rar -h" for the Debian GNU/Linux system (but may be used by oth‐ (07-09 00:11) 回复
3. XiaJing: 还有命令行下的unrar。AUTHOR This manual page was written by Petr Cech <cech@debian.org> according to "rar -h" for the Debian GNU/Linux system (but may be used by oth (07-09 00:12) 回复
4. XiaJing: 压缩文件名为中文用 unrar e xxx.rar可以正确解压，看来问题在file roller上。 (07-09 00:28) 回复
5. XiaJing: file roller用rar，所以卸载rar，重装unrar可以解决解压问题。 (07-17 21:05) 回复
6. XiaJing: UNRAR 4.00 beta 3 freeware Copyright (c) 1993-2010 Alexander Roshal (07-17 20:51) 回复
7. XiaJing: RAR 4.00 beta 3 Copyright (c) 1993-2010 Alexander Roshal 17 Dec 2010 Shareware version Type RAR -? for help (07-17 20:52) 回复
8. XiaJing: 该文件用rar解压中文为乱码，用unrar解压正常。 (07-17 21:03) 回复
XiaJing: ubuntu的ftp client , FileZilla ，包含file name filter，很方便，查阅服务器文件时可以滤出希望的内容，但没有像flashfxp那样高亮显示包含特定字符串的文件的功能。回复

(07-08 14:06)
XiaJing: 试了下笔记本上ubuntu的双显示器，用VGA线接上电视，在system-preferences-monitors里可以detect显示器，并可以设置。然后通过键盘的功能键两个显示器可以设置成显示相同内容，相同的第二个屏幕内容，两个屏幕内容并列显示，这样回复

(07-07 10:36)
1. XiaJing: 这样就可在一个屏幕查资料，在另一个屏幕写记录。 (07-07 10:44) 回复
XiaJing: 有些网站做事不光明，比如注册的wy信箱，收到wy微博信件说有两条新评论，但打开一看，根本没有，而且关注的人有30个，之前并没有手动设置关注一个人。回复

(07-07 09:15)
1. XiaJing: 类似的网站还有rr，信箱里经常收到来自rr的好友请求。其实是网站假冒用户的名义发的。 (07-07 09:20) 回复
2. XiaJing: 昨天看了开心起诉qianxiang的案子，说qianxiang的(jia)开心推广中侵犯隐私，发垃圾邮件。rr也是qianxiang的。qianxiang的做法很不对。 (07-07 09:30) 回复
XiaJing: ubuntu tool, top , powertop 回复

(07-06 16:12)
XiaJing: ubuntu的system V和 upstart。help.ubuntu.com/community/UbuntuBootupHowto 回复

(07-04 18:05)
XiaJing: • Meeting entries remind you of events that have a specific date and time.• Meeting requests are invitations that you can send to the participants. Before youcan create meeting requests you must h 回复

(07-02 19:25)
1. XiaJing: Before you can create meeting requests you must have a compatible mailbox configured to your device. • Memo entries are related to the whole day but not to a specific time of the day. • Anniversary (07-02 19:26) 回复
2. XiaJing: Anniversary entries remind you of birthdays and special dates. They refer to a certain day but not a specific time of the day. Anniversary entries are repeated every year. (07-02 19:27) 回复
3. XiaJing: To-do entries remind you of a task that has a due date but not a specific time of the day. (07-02 19:27) 回复
4. XiaJing: 所以，用会议可以更精确。 (07-02 19:28) 回复

559 1 ... ‹‹ 7 8 9 10 11 ›› ... 28

XiaJing: tor, Jul 02 08:47:25.464 [Warning] Problem bootstrapping. Stuck at 10%: Finishing handshake with directory server. (DONE; DONE; count 3; recommendation warn) 回复

(07-02 09:22)
XiaJing: ubuntu11.04的firefox4.0不能打开webster的声音。回复

(06-29 17:56)
XiaJing: Bounced Check。跳票。www.investorwords.com/561/bounced_check.html 回复

(06-27 18:12)
XiaJing: Natty Narwhal 回复

(06-27 18:03)
XiaJing: 问题：Blender, u3d？回复

(06-27 17:53)
XiaJing: GNOME Sensors Applet 回复

(06-27 15:48)
XiaJing: drwxr-xr-x 5 xiajing xiajing 12288 2011-06-27 13:27 da-rwxrwxrwx. 1 root root 5042038 2009-04-22 03:02 ini drwxr-xr-x 3 root root 4096 2010-01-18 16:32 m -rwxrwxrwx. 1 x 回复

(06-27 14:15)
1. XiaJing: 注意x后1前的“点”：-rwxrwxrwx. 1 (06-27 14:16) 回复
XiaJing: psensor的bug，当关掉独显时，其sensor的值无效且极大，勾选绘制，psensor仍然处理该无效的大数，导致处理时间过长，界面僵住。打开独显，界面正常。回复

(06-27 10:27)
XiaJing: 备份我的迷你博客：#!/bin/bashfor i in {1..19};dowget -P OK " hi.****.net/space-1862655-do-doing-view-me-page-$i.html"done 回复

(06-27 08:05)
XiaJing: http askubuntu.com/questions/39562/radeon-module-boot-problems 回复

(06-27 00:06)
1. XiaJing: thanks marto: add blacklist radeon to the end of /etc/modprobe.d/blacklist.conf (06-27 00:19) 回复
2. XiaJing: add these lines before 'exit 0' in /etc/rc.local "modprobe radeon echo OFF > /sys/kernel/debug/vgaswitcheroo/switch" (06-27 00:21) 回复
3. XiaJing: Ubuntu11.04, HP notebook, AMD Radeon HD 6470M.独显驱动导致黑屏的解决。 (06-27 00:36) 回复
XiaJing: ubuntu11.04, more /etc/default/console-setup 和 /etc/default/keyboard 配置缺省键盘和console 回复

(06-26 23:08)
XiaJing: Ubuntu dmesg[ 156.499343] radeon: switched off[ 156.565554] radeon 0000:01:00.0: power state changed by ACPI to D3 回复

(06-26 15:14)
1. XiaJing: uk.computers.toshiba-europe.com/innovation/download_whitepaper.jsp?service=UK&WHITEPAPER_ID=00000004c6 (06-27 00:30) 回复
2. XiaJing: 01/07/98 ACPI Specification (06-27 00:31) 回复
3. XiaJing: D3 - Off , D0 – Fully On (06-27 00:31) 回复
XiaJing: Ubuntu下双显卡的设置，help.ubuntu.com/community/HybridGraphics 回复

(06-26 00:07)
XiaJing: HP双显卡的机器进入Ubuntu有时候卡住，比如由市电转为电池供电时，这时需要先进Win7，重启，然后才能进入Ubuntu。回复

(06-25 20:09)
1. XiaJing: 问题在sudo bash -c "echo OFF > /sys/kernel/debug/vgaswitcheroo/switch"，和 restart上，shutdonw后再重启问题解决。 (06-25 20:40) 回复
2. XiaJing: 表面现象，没有探求内部原因。待软件升级自动解决。 (06-25 20:42) 回复
3. XiaJing: 该问题的出现和解决是随机的，时好时坏，主要原因是，显卡驱动，先不载入显卡驱动，然后载入再关掉。 (07-04 17:01) 回复
4. XiaJing: 见06-27 00:06的解决。 (07-04 17:02) 回复
XiaJing: 问题：HP 笔记本的触摸板在UBUNTU无双击锁定功能，找其特定驱动回复

(06-25 10:53)
XiaJing: Ubuntu 11.04 停用独立显卡，sudo bash -c "echo OFF > /sys/kernel/debug/vgaswitcheroo/switch"，如果sudo echo OFF > /sys/kernel/debug/vgaswitcheroo/switch则permision denied 回复

(06-25 10:04)
1. XiaJing: http://ubuntuforums.org/showthread.php?t=1495123&page=8 (06-25 10:10) 回复
2. XiaJing: sudo cat /sys/kernel/debug/vgaswitcheroo/switch (06-25 10:11) 回复
3. XiaJing: 该语句在/etc/rc.local中加载后黑屏。 (06-25 10:54) 回复
4. XiaJing: 启用独显，sudo bash -c "echo DDIS > /sys/kernel/debug/vgaswitcheroo/switch" (06-25 11:32) 回复
5. XiaJing: 关掉独显功率为17W左右，打开独显功率为28W左右，独显消耗大量能量。 (06-25 21:17) 回复
6. XiaJing: 在Ubuntu下用Indicator Applet Complete 查看。 (06-25 21:19) 回复
7. XiaJing: cat /proc/acpi/battery/BAT0/info (06-28 18:57) 回复
XiaJing: info bash,then press s to search shell command. 回复

(06-25 09:12)
XiaJing: Ubuntu11.04的Unity不是很习惯，不如traditional env，不过似乎对显卡有要求，升级了显卡驱动提示：It seems that you do not have the hardware required to run Unity. 回复

(06-25 07:55)
XiaJing: HP笔记本预装的Win7把四个主分区都用了，虽可shrink腾空间，但无法创建扩展分区，Ubuntu11.04的安装CD的分区工具虽可调整C盘大小，但add按钮是灰色的。回复

(06-24 22:08)
1. XiaJing: 解决办法1：用partimage工具备份一个主分区(recovery)，删该主分区，创建同样大小的逻辑分区恢复。 (06-24 22:12) 回复
2. XiaJing: 该方法要动recovery分区,一个备份分区,不是很好. (06-24 22:22) 回复
3. XiaJing: 解决办法2:用Partition Wizard工具将C盘变为扩张分区中的逻辑盘 (06-24 22:24) 回复
4. XiaJing: PW是free software, C盘也是可以变动的，很好。 (06-24 22:25) 回复
5. XiaJing: 扩展分区 (06-25 21:41) 回复
XiaJing: OO Writer里显示空格 tools->options-> OO.org Writer->Formatting Aids 回复

(06-18 10:27)

559 1 ... ‹‹ 8 9 10 11 12 ›› ... 28

XiaJing: Online office suite 回复

(06-17 13:27)
1. XiaJing: Think free 对中文的支持很有限，很多中文字都是方块。 (06-17 14:14) 回复
2. XiaJing: Zoho感觉还不错，有中文支持，不过对safari的支持还有待加强。 (06-18 21:02) 回复
XiaJing: Adobe Buzzword 不支持中文输入。回复

(06-17 13:19)
XiaJing: 设置imap后，通过"同步"->“文件夹订阅”可以同步“草稿箱”里的内容，但不能修改。回复

(06-17 11:27)
XiaJing: Nokia的手机，电邮服务->新信箱->开始，出现了预设的邮箱供应商帐号，自己的邮箱不再此列，选其他，输入帐号，密码，显示正在验证电子邮件，然后跳出。解决办法，输入错误的帐号和密码。如1@1 1 回复

(06-17 11:19)
XiaJing: ipad上的手写软件：UYH，UPAD Lite，neu.Notes。回复

(06-15 22:57)
1. XiaJing: Remote desktop 软件：2X Client (06-15 23:00) 回复
2. XiaJing: 新闻软件：CNN，AP News，NPR (06-15 23:04) 回复
3. XiaJing: 数学软件：PocketCAS (06-15 23:06) 回复
4. XiaJing: 办公软件：free spreadsheet 支持CSV和共享 (06-15 23:08) 回复
5. XiaJing: PDF阅读软件：stanza,iBooks (06-15 23:14) 回复
6. XiaJing: 字典：merriam Webster (06-15 23:16) 回复
XiaJing: 试试safari,不支持的地方不少，另外ipad2还是比较沉的。回复

(06-04 23:23)
XiaJing: 这几天楼层电气间多了个配电箱，内有HEADWAY GYXTW光缆。回复

(05-30 21:24)
XiaJing: word 2003在自动编号后插入表格可以实现表格的各格自动编号(横向), 也可实现第一例按行编号，其他列不能有编号，不然编号先横向递增。回复

(05-18 22:58)
XiaJing: 用xp的“文字服务和输入语言”安装日语 Microsoft IME Standard 2002 ver. 8.1 和Microsoft Natural Input 2002 ver. 8.1就可以用IME pad手写输入识别日文。回复

(05-14 11:06)
1. XiaJing: 衬衫上的标识, 棉 50% ポリエステル 50%, 后者手写识别翻译为Polyester。 (05-14 11:08) 回复
XiaJing: DIY Layout Creator,diylc-3.0.8-beta 回复

(05-09 23:38)
1. XiaJing: perfboard( perforated board), Stripboard (05-09 23:45) 回复
2. XiaJing: www.printedcircuitsboards.com/software/88/veroboard-stripboard-software.html (05-09 23:53) 回复
XiaJing: ppt到word的转换，ppt->pdf->word 回复

(05-07 18:14)
1. XiaJing: www.pdftoword.com (05-07 18:19) 回复
XiaJing: kicad tutorial 回复

(05-07 11:21)
XiaJing: RF Components and Circuits Publisher: Newnes | ISBN: 0750648449 | edition 2002 415 pages 回复

(05-07 00:35)
1. XiaJing: 1N4148 (05-07 00:40) 回复
2. XiaJing: The Circuit Designer’s Companion Second edition Tim Williams Newnes 2005 (05-07 11:30) 回复
XiaJing: Programmable Oscillator Uses Digital Potentiometers 回复

(05-06 23:56)
1. XiaJing: AN-580 (05-07 00:00) 回复
2. XiaJing: Sine Wave Generation Techniques National Semiconductor Application Note 263 March 1981 (05-07 00:01) 回复
XiaJing: paramagnetic, diamagnetic, nonmagnetic materials 回复

(05-06 23:21)
1. XiaJing: ferromagnetic (05-06 23:24) 回复
2. XiaJing: www.ndt-ed.org/EducationResources/CommunityCollege/MagParticle/Physics/MagneticMatls.htm (05-06 23:24) 回复
XiaJing: SAW resonators 回复

(05-06 23:20)
1. XiaJing: max2620 (05-08 10:30) 回复
XiaJing: LTsice IV SPICE directive: K1 L1 L2 L3 1.www.simonbramble.co.uk/lt_spice/ltspice_lt_spice_tutorial_3.htm 回复

(05-06 20:38)
XiaJing: 《双色图文详解电容器及应用电路》胡斌人民邮电出版社回复

(05-02 22:23)
XiaJing: Electronics Sensors for the Evil Genius: 54 Electrifying Projects 回复

(04-26 23:24)
1. XiaJing: Fun Projects for the Experimenter - N. Braga with METAL DETECTOR (05-06 20:55) 回复
XiaJing: Radio Society of Great Britain_Microwave Know How for the Radio Amateur_Andy Barter_2010, 振荡器论文www.vhfcomm.co.uk/i-oscillators.html，方向：DDS，MMIC 回复

(04-26 22:38)
1. XiaJing: Artech House_Foundations of Oscillator Circuit Design_Guillermo Gonzalez 2007 (04-26 23:06) 回复

559 1 ... ‹‹ 9 10 11 12 13 ›› ... 28

XiaJing: geda:* 1 INVERTINGINPUT* 2 NON-INVERTING* 3 OUTPUT* 4 POSITIVEPOWERSUPPLY* 5 NEGATIVEPOWER.SUBCKT LM124 1 3 2 4 5 建立sym时的pinseq属性的顺序从1到5要对应上面的13245。回复

(04-25 21:26)
1. XiaJing: 保证netlist中的“XU1 inv out non pos 0 LM124“语句中的顺序与subckt中一致。 (04-25 21:30) 回复
XiaJing: geda:SPICE model (LMXXX.mod),SPICE include(xjsim.cmd),gnetlist -g spice-sdb -o xj.net xj.schngspice -b xj.net -r result.raw -o message.loggwave result.raw 回复

(04-24 10:28)
XiaJing: bash. $history 回复

(04-23 23:49)
XiaJing: Newnes_Oscilloscopes How to use them how they work_5th ed_Ian Hickman 2000 回复

(04-22 23:56)
XiaJing: 电容小，响应快，但电抗也大，用作耦合电容时分压也大。增加负载阻抗虽然可以增加负载电压，但放电时间延长，如果有开关电路，会形成严重拖尾。所以电容值和负载阻抗值的选取很重要。回复

(04-22 11:35)
1. XiaJing: 电容小，电抗大，增加频率减小电抗。 (04-22 22:48) 回复
XiaJing: Electronic Test Instruments: Analog and Digital Measurements (2nd Edition) Practical Radio Frequency Test and Measurement: A Technician's Handbook 回复

(04-19 23:20)
1. XiaJing: Analog and Digital Filter Design Using C (Bk/Disk), 1/e Leslie D. Thede (04-19 23:45) 回复
2. XiaJing: Synthetic Instruments Concepts and Applications by C.T. Nadovich 2005 (05-08 09:27) 回复
3. XiaJing: Electronic Instrument Handbook Clyde F. Coombs 1999 (05-08 09:29) 回复
XiaJing: The Book of Postfix: State-of-the-Art Message Transport Linux Email By Alistair McDonald, Ian Haycox, Magnus Bäck Postfix: The Definitive Guide 回复

(04-19 00:24)
XiaJing: Linux Command Line and Shell Scripting Bible [Paperback]Richard Blum 2008 回复

(04-19 00:03)
XiaJing: R2011a Documentation → MATLAB,[SN,CN,DN] = ellipj(U,M), U is limited to real values. 回复

(04-18 23:21)
1. XiaJing: 问题：u为复数，sn(u+jX,M)的计算。 (04-18 23:29) 回复
XiaJing: mutt +msmtp , ~/.muttrc set from= set realname set sendmail="msmtp" ~/.msmtprc account defaulthost smtp.xx.cnauth loginfrom xj@xx.cnuser xjpassword xx 回复

(04-18 20:05)
1. XiaJing: 发附件：mutt -s "Test mail" xj@xxx.com -a attachedfile < mailtext (04-18 20:05) 回复
2. XiaJing: 可以将资料都传到邮箱。 (04-18 20:07) 回复
3. XiaJing: email control (04-18 21:55) 回复
4. XiaJing: Postfix instead of msmtp (04-18 22:08) 回复
5. XiaJing: 刚开始一直都发不了邮件，包括msmtp得不到serverinfo,花了不少时间找原因，原来两年前把25端口就封了。 (04-18 23:36) 回复
XiaJing: How do I configure Mutt to use a remote SMTP server to send mail?Mutt can't do so directly (read the MailConcept to understand why this won't change). You must specify a local MTA to do it. 回复

(04-18 16:43)
1. XiaJing: wiki.mutt.org/?MuttFaq/Sendmail (04-18 16:44) 回复
2. XiaJing: Update: Recent versions (1.5.x) of Mutt has built-in SMTP support. (04-18 16:57) 回复
XiaJing: ubuntu中设置硬件时间是否为本地时间或UTC时间。/etc/default/rcS，UTC=no，可以man rcS。date设置系统时间，hwclock 设置 hardware clock。回复

(04-18 09:06)
1. XiaJing: tzselect (04-18 10:28) 回复
XiaJing: 需要找一个精度很高的数值积分程序计算椭圆积分。回复

(04-17 21:12)
1. XiaJing: 直接调用，svn.scipy.org/svn/scipy/trunk/scipy/special/specfun/specfun.f，fortran程序 (04-17 23:12) 回复
XiaJing: Bessel->Butterworth->Chebyshev II->Chebyshelf I->Elliptic filters 由左到右是从相位响应优先到幅度响应优先。回复

(04-16 23:48)
XiaJing: IFS="#newline#"for i in $(grep -ir "\.asc" dem* ) ; do #"\.asc",加引号才转义 # echo $i echo -e "\n \n..............."done 回复

(04-16 14:11)
XiaJing: wget：有时候下载，只是前1分钟有数据传输，之后便是无响应。为了利用这个突发传输，增加请求的频率，可以编写脚本，也可以使用wget -T 20 -c url，20秒等待，缺省是900秒。回复

(04-16 12:05)
XiaJing: LC Tank，sqrt(1/LC)虽然是谐振角频率,但出现了两个*度, L和C,频率一定,即约束条件,LC=常数，则不同的C值,其选择性不同。再考虑并联的R,则R越大品质因数越大选择性越好,并联品质因数为R/sqrt(L/C),可见只考虑R 回复

(04-16 00:26)
1. XiaJing: 其实L和C的选择也很重要, 可设L为变量,频率一定,改变L观察选择性. (04-16 00:28) 回复
XiaJing: Mathematica6的Manipulate函数，其中的第二个参数，即控制参数必须显式的出现在表达式参数中，如Manipulate[Plot[x*a,{x,0,4}],{a,1,3}]可以，但y=x*a;Manipulate[Plot[y,{x,0,4}],{a,1,3}]就不可行。回复

(04-15 23:59)
XiaJing: Foundations of OscillatorCircuit DesignGuillermo Gonzalez 回复

(04-15 07:56)
XiaJing: Microwave Switches: Application Notes.www.herley.com/index.cfm?act=app_notes&notes=switches 回复

(04-14 23:29)

559 1 ... ‹‹ 10 11 12 13 14 ›› ... 28

XiaJing: Fedora Electronic Lab，spins.fedoraproject.org/fel/#portfolio 回复

(04-12 23:20)
XiaJing: 有关geda和ngspice、gnu-cap的tutorial。ashwith.wordpress.com/2010/09/10/circuit-simulation-in-gnulinux-lets-begin/ 回复

(04-12 23:14)
XiaJing: National Semiconductor SPICE Macromodels。Op Amp SPICE & IBIS Models。 www.national.com/analog/amplifiers/spice_models 回复

(04-12 21:58)
XiaJing: type lsls is aliased to `ls --color=auto' 回复

(04-11 22:17)
1. XiaJing: type -a ls ls is aliased to `ls --color=auto' ls is /bin/ls (04-11 22:20) 回复
2. XiaJing: Carl Albing, JP Vossen, and Cameron Newham,bash Cookbook,O’Reilly.2007 (04-11 22:33) 回复
XiaJing: 备份迷你博客：for i in {1..16};do wget http：//hi.****.net/space-1862655-do-doing-view-me-page-$i.htmldone 回复

(04-10 14:53)
XiaJing: A minimum-phase transfer function is one where there are no zeros in the right-half of the s plane.Larry D. Paarmann Design and analysis of analog filters, p77 回复

(04-09 21:05)
XiaJing: active filter design:www.educypedia.be/electronics/electroniccalculatorsfilter.htm 回复

(04-09 11:45)
1. XiaJing: TI:Chapter16 Active Filter Design Techniques(Excerpted from Op Amps for Everyone) (04-09 12:07) 回复
2. XiaJing: Active-Filter Cookbook D.Lancaster 1975,same as 2nd ed. (04-09 12:09) 回复
3. XiaJing: PSpice for Filters and Transmission Lines Morgan and Claypool Publishers | 2007 (04-09 12:10) 回复
XiaJing: KiCad, kicad.sourceforge.net/wiki/Main_Page 回复

(04-08 12:05)
XiaJing: numpy array:横:[[[a,b]]],竖:[[[c],[d]]],纵:[[[e]],[[f]]]。四维：[[[[1,2],[3,4]],[[-1,-2],[-3,-4]]],[[[91,92],[93,94]],[[-91,-92],[-93,-94]]]] 回复

(04-05 10:23)
1. XiaJing: numpy.shape: 横(1,1,2)，竖(1,2,1),纵(2,1,1),四维(2,2,2,2) (04-05 12:01) 回复
2. XiaJing: numpy.reshape(, ( 外->内 ) ) (04-05 12:03) 回复
XiaJing: mayavi2嵌入到wx，3.4的#from enthought.mayavi.core.ui.api import SceneEditor, MlabSceneModel对应3.2的from enthought.tvtk.pyface.scene_editor import SceneEditor 回复

(04-04 17:34)
1. XiaJing: from enthought.mayavi.tools.mlab_scene_model import MlabSceneModel (04-04 17:34) 回复
XiaJing: The Visualization ToolKit (VTK) is an open source, freely available software system for 3D computer graphics, image processing, and visualization used by thousands of researchers and developers around 回复

(04-04 15:38)
XiaJing: 动态演示的方案：gif, swf, 或视频格式，gif的不足是颜色的限制，只有256色。png虽然可以支持更多的颜色，但不支持动画，只能期待APNG格式的普及。所以swf是选择之一，用png2swf工具转换也很方便。回复

(04-04 11:29)
XiaJing: mayavi 中使用numpy.mgrid，若使用numpy.meshgrid则存在问题。回复

(04-03 23:35)
1. XiaJing: mayavi2 (04-04 17:03) 回复
2. XiaJing: 针对mlab.surf函数 (04-04 18:11) 回复
XiaJing: 编译wxwidget 报错 : /usr/include/wx-2.8/wx/utils.h:50: error: forward declaration of ‘struct wxFrame’, 原因是缺少libwxgtk2.8-dev 回复

(04-02 14:23)
XiaJing: PLplot:plplot.sourceforge.netVeusz:home.gna.orgoctaviz:octaviz.sourceforge.netUDAV:udav.sourceforge.netvisit:wci.llnl.gov/codes/visit/home.html 回复

(04-02 12:01)
1. XiaJing: mathgl:mathgl.sourceforge.net (04-02 12:06) 回复
2. XiaJing: www.xmarks.com (04-02 12:11) 回复
XiaJing: matplotlib错误:ValueError: Unknown projection '3d' .原因是把1.01的例子用在了0.99环境中。前者fig = plt.figure() ax = fig.add_subplot(111, projection='3d')，后者fig = pylab.figure() ax = axes3d.Axes3D(f 回复

(03-31 21:28)
XiaJing: ps2pdf - Convert PostScript to PDF using ghostscript. ps2pdf12 ps2pdf13 回复

(03-31 12:27)
XiaJing: for j in =*; do if [ -f $j ] ; then echo; fi ;done 回复

(03-29 23:01)
XiaJing: 批量下载eml文件，然后用for f in *.eml; do munpack $f; done 提取附件，eml可用文本编辑器打开。回复

(03-29 22:26)
XiaJing: Network: ERR-No Active Peers, Check Network Connection and Firewall.07:10:22.480 ERROR [JobQueue3 ] networkdb.reseed.ReseedChecker: Downloading peer router information for a new I2P installation 回复

(03-29 15:45)
1. XiaJing: 找个可行的.i2p folder替换 (03-29 15:46) 回复

559 1 ... ‹‹ 11 12 13 14 15 ›› ... 28

XiaJing: Audacity® is free, open source software for recording and editing sounds. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems. 回复

(03-28 21:46)
1. XiaJing: GUI：wxWidgets (03-28 21:53) 回复
XiaJing: firefox history:Win XP:C:\Documents and Settings\<user>\Application Data\Mozilla\Firefox\Profiles\<profilefolder>\places.sqlite,GNU/Linux:/home/<user>/.mozilla/firefox/<profilefo 回复

(03-28 16:18)
XiaJing: 作者的知识背景决定了所著书籍的内容倾向。GNU/Linux Application Programming, 2nd Edition M. Tim Jones就倾向于嵌入式应用。如对内核,虚拟化,编译工具链等方面的涵盖,，这都是开发嵌入式应用所需要的。回复

(03-28 14:48)
XiaJing: Preemption (computing), ability of an operating system to stop a currently scheduled task in favour of a higher priority task. 回复

(03-28 14:00)
XiaJing: 运行echo "Beautiful day! " | festival --tts 提示Linux: can't open /dev/dsp。在Sound Preferences->Hardware-Profile更改驱动为Digital Stereo Output+Analog stereo input 解决。回复

(03-27 20:36)
1. XiaJing: espeak -p 10 -s 130 -f t.txt (03-28 10:02) 回复
XiaJing: execl, execlp, execle, execv, execvp - execute a fileThese functions are front-ends for execve. 回复

(03-27 12:19)
XiaJing: Variadic function:In computer programming, a variadic function is a function of indefinite arity, i.e. one which accepts a variable number of arguments. 回复

(03-27 11:26)
XiaJing: python, 删除list的元素，a[-2:-1]=[]删除倒数第二个元素，但a[-1:0]并不能删除倒数第一个元素，要用a[-1:]=[]，或者a.pop() 回复

(03-22 21:19)
XiaJing: 用cxfreeze生成的Win32程序在运行时提示“The application requires a version of wxPython greater than or equal to 2.8,but a mathching version was not found. ” 回复

(03-21 20:03)
1. XiaJing: 原因是py代码包含：import wxversion wxversion.ensureMinimal('2.8')，去掉即可。 (03-21 20:03) 回复
XiaJing: windows下的python:matplotlib-1.0.1.win32-py2.7.exe,numpy-1.5.1-win32-superpack-python2.7.exe,python-2.7.1.msi,wxPython2.8-win32-unicode-2.8.11.0-py27.exe 回复

(03-19 18:54)
XiaJing: linux:man 3 printf 回复

(03-19 16:31)
XiaJing: xvidcap1.1.7不从ubuntu仓储安装，直接到sourceforge.net/projects/xvidcap/页面下载，前者无声音对话框且录制无声音。回复

(03-15 17:10)
XiaJing: 调试WR天线: 客户端固定并安装ssh，手机安装ssh与客户端通信监测客户端接收情况，同时调整WR天线。WR:wireless router 回复

(03-15 11:15)
1. XiaJing: 反射天线初步能提高7个dB左右，下一步研究衰减与距离的关系。 (03-15 11:18) 回复
XiaJing: debian , 待变回复

(03-14 23:14)
XiaJing: virtuous circle,Vicious circle.en.wikipedia.org/wiki/Virtuous_circle_and_vicious_circle 回复

(03-14 15:02)
XiaJing: qemu 回复

(03-13 23:33)
XiaJing: cramfs: sudo mount -o loop -t cramfs ./armbase_2.5.cramfs /mnt/arm-rfs/ 回复

(03-13 22:41)
XiaJing: 6410开发板烧写了android2.2,用后感觉其对于非手机的设备支持有限。继续关注。回复

(03-13 16:41)
XiaJing: linux ec2: Amazon Elastic Compute Cloud (EC2) 回复

(03-13 11:01)
XiaJing: #sudo iwlist eth1 scanning Frequency:2.462 GHz (Channel 11) Quality:5/5 Signal level:-42 dBm Noise level:-92 dBm 回复

(03-12 20:15)

559 1 ... ‹‹ 12 13 14 15 16 ›› ... 28

XiaJing: 感觉zf对网络的“丰索”更加严格了。国外的有些网站做的很好，没有广告，又可以发文件(教学文件)，但这也被禁止了。回复

(03-09 10:56)
XiaJing: Karim Yaghmour, Jon Masters, Gilad Ben-Yossef, Philippe Gerum, "Building Embedded Linux Systems" O'Reilly Media, Inc. | ISBN: 0596529686 | August 26, 2008 回复

(03-09 00:24)
1. XiaJing: Gene Sally,Pro Linux Embedded Systems,Apress,December 29, 2009 (03-13 23:33) 回复
2. XiaJing: Embedded Digital Signal Processing Systems.pdf (03-13 23:47) 回复
3. XiaJing: Wiley.IEEE.Press.Embedded.Signal.Processing.with.the.Micro.Signal.Architecture.Feb.2007 (03-13 23:48) 回复
4. XiaJing: LabVIEW Experiments and Appendix Accompanying Embedded Signal Processing with the Micro Signal Architecture By Dr. Woon-Seng (03-13 23:50) 回复
5. XiaJing: ftp://ftp.ni.com/pub/devzone/tut/exp_isbn_978_0_471_73841_1.pdf (03-13 23:50) 回复
XiaJing: linux:dmesg - print or control the kernel ring buffer.The program helps users to print out their bootup messages. 回复

(03-08 22:00)
XiaJing: 无线路由器里对于DHCP分配的机器和设置成固定IP的机器可见性不同. 回复

(03-07 11:15)
XiaJing: s3c6410的linux.编写脚本:ifconfig eth0 192.x.x.x up, route add default gw 192.x.x.x ， echo nameserver 202.x.x.x > /etc/resolv.conf 。然后可用ftp, busybox里的wget等工具传文件.前提自建web或ftp server。回复

(03-06 18:23)
1. XiaJing: 有时需更改MAC地址避免重复# ifconfig ethX down # ifconfig ethX hw ether NEW_MAC_ADDR # ifconfig ethX up (03-07 10:42) 回复
XiaJing: The US Trade Representative (USTR) accused Baidu of steering consumers to third-party websites where pirated material is hosted.Critics accuse China of not protecting intellectual property rights. 回复

(03-01 17:47)
XiaJing: 与youtube一样被封的还有wikipedia的图片服务器，公式图片也无法显示，可见对于不健康的东西是宁可错杀一千绝不放走一个。虽然可以用”爱兔癖“解决，但速度只有几kbps，期待好转。回复

(03-01 16:59)
XiaJing: 2011年:只要dictionary文件做的好，wpa可以很快破解。回复

(03-01 10:17)
XiaJing: 数独可以用递归算法求解，速度还挺快。在该类问题上递归和循环的区别是在速度和代码长度上，前者速度慢但代码短，后者速度快，但循环嵌套数大(数独需要81个)并且运行时不能改变，每一个循环的的代码都重复。回复

(03-01 10:04)
XiaJing: 流传的用hosts文件指定域名的IP地址的方法来访问youtube似乎不可行，猜测为IP*。用代理可行，但一般都收费。其实youtube上还有很多教学视频，很健康的东西。回复

(02-28 11:02)
XiaJing: 注意到迷你博客没有年份的显示，只有月日小时分钟。回复

(02-27 09:20)
XiaJing: bt, spoonwep, spoonwpa, Gerix Wifi Cracker NG 回复

(02-26 22:27)
XiaJing: ReaView MDK-ARM中，通过创建Debug Functions打印数组的值(算法结果)，然后进行验证。回复

(02-18 18:07)
XiaJing: LMS 除了least mean square, 还有 learning management system ，如*Chamilo*Claroline*Democrasoft*Dokeos*eFront*ILIAS*Moodle*Sakai 回复

(02-13 19:59)
XiaJing: bit reverse algorithm, for (k=0, khat=0; k<N; k++) {X[khat]=x[k];for (bit=N/2; (khat & bit)!=0; bit >>=1)khat ^= bit;khat ^= bit;} 回复

(02-12 22:25)
1. XiaJing: ARM DAI 0016C 1996 (02-12 22:27) 回复
2. XiaJing: RBIT Reverse the bit order in a 32-bit word,RBIT Rd, Rn Reverse Bits (02-12 22:35) 回复
XiaJing: gcc编译c代码，提示“undefined reference to `sin' ”，或其他函数，cos等，原因是没有指定(数学)库文件libm.so，加上开关和参数 -lm 就可。回复

(02-11 11:53)
XiaJing: 新买的优盘, 用MyDiskTest版本2.93 Beta测试,选坏块检测,提示有坏块,检测若干次,每次都提示有坏块,但位置在进度条中的显示不确定.用其他软件测试,通过.拷贝大文件,占满优盘,然后sha1sum校验,无误.疑MyDiskTest误报. 回复

(01-23 20:14)
XiaJing: UM0600User manualSTM3210C-EVALevaluation board 回复

(01-19 22:47)
XiaJing: OTP (one-time programmable). White Paper Thin-Film-Transistor (TFT) LCD Display Control Electronics Design and Operation Revision 1.0 DENSITRON TECHNOLOGIES plc. 回复

(01-17 21:16)
1. XiaJing: common voltage (VCOM) (01-17 23:07) 回复
XiaJing: 名称 :autorun.inf 大小 : 87432 byte SHA1 : 5254bedd866db160df357cb94800ebeea1fdb36b http.virscan.org 回复

(01-16 15:30)
1. XiaJing: 发现的病毒 (01-16 15:31) 回复
2. XiaJing: support.microsoft.com/kb/962007 (01-16 15:41) 回复
3. XiaJing: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Schedule start REG_DWORD 原始为2 修改为4 (01-16 16:04) 回复
4. XiaJing: http://www.kaspersky.com/support/downloads/utils/kk.zip (03-04 11:02) 回复

559 1 ... ‹‹ 13 14 15 16 17 ›› ... 28

XiaJing: filter design tool: www.circuitsage.com/filter.html 回复

(01-15 16:34)
1. XiaJing: FilterLab_ microchip (01-15 16:39) 回复
2. XiaJing: Mr filter: An active filter design assistant on linux (01-15 16:45) 回复
XiaJing: ValueError: itemsize mismatch: audio_alsa_source(1):0 using 4, xxxxxxx:0 using 8, 原因为source和sink类型不匹配，如source输出为浮点，但sink要求输入为复数。回复

(01-12 23:07)
1. XiaJing: Signal Processing Blocks中的Type Conversions里有相应的类可以进行类型转换。 (01-12 23:53) 回复
XiaJing: python: import module dir(module) 回复

(01-11 20:43)
XiaJing: All three interrupt lines are ORed together to a single channel of the vectored interrupt controller. OR AND XOR NOT 回复

(01-05 11:27)
XiaJing: uint8_t bLength; 0x12uint8_t bDescriptorType; 0x1uint16_t bcdUSB;0x200uint8_t bDeviceClass;0x0uint8_t bDeviceSubClass;0x0uint8_t bDeviceProtocol;0x0uint8_t bMaxPacketSize0;0x8 回复

(01-03 20:58)
1. XiaJing: uint16_t idVendor;0x46d uint16_t idProduct;0xc00e uint16_t bcdDevice;0x1110 uint8_t iManufacturer;0x1 uint8_t iProduct;0x2 uint8_t iSerialNumber;0x0 uint8_t bNumConfigurations;0x1 (01-03 20:58) 回复
2. XiaJing: 鼠标的Device Descriptors (01-03 20:59) 回复
XiaJing: usb_device_descriptor, idVendor, idProduct. www.linux-usb.org/usb.ids 回复

(01-02 00:08)
XiaJing: ldd - print shared library dependencies. gcc XX -L/usr/lib -lusb, 对应libusb.so 回复

(01-01 22:58)

2010年迷你博客

XiaJing: If the declaration of an identifier for an object has file scope and an initializer, thedeclaration is an external definition for the identifier. --c99 pp157 回复

(12-31 12:06)
XiaJing: getopt.h中，char *const *___argv是指向指向字符串的指针常量的指针。回复

(12-31 10:31)
XiaJing: c++中，char *cp="A,B,C,D,E"语句将产生提示：deprecated conversion from string constant to ‘char* ’ 回复

(12-31 10:05)
XiaJing: c99:INTERNATIONAL STANDARD ISO/IEC 9899 Second edition 1999-12-01 Programming languages — C 回复

(12-30 23:09)
1. XiaJing: A function declaration can contain the storage-class specifier static only if it is at file scope。--c99 (12-30 23:16) 回复
XiaJing: #include <string.h>和#include <string> 是两个不同的库，前者是/usr/include/string.h，后者是/usr/include/c++/x.x/string。回复

(12-30 21:42)
XiaJing: Package: manpages-dev (3.21-1) ,Manual pages about using GNU/Linux for development.These man pages describe the Linux programming interface. 回复

(12-29 16:42)
1. XiaJing: ubuntu (12-29 16:43) 回复
2. XiaJing: 包含sysconf(3)，因为getconf(1)需要参考sysconf(3) (12-29 16:48) 回复
3. XiaJing: 例：getconf HOST_NAME_MAX (12-29 16:49) 回复
XiaJing: uname - print system information . -r, --kernel-release print the kernel release 回复

(12-29 15:40)
XiaJing: 用脚本将project中的GB格式的源文件批量转换成UTF,这里用到tcs程序. for i in $(find | grep -i "\.[hc]$") do tcs -f gb $i > $i.t mv $i.t $idone 回复

(12-28 11:47)
XiaJing: Opengrok在ubuntu9.04,tomcat6下的安装需要更改init.d的tomcat6脚本中关于java的安全设定才能工作，参考： w.livedoor.jp/sanou/d/%A5%A4%A5%F3%A5%B9%A5%C8%A1%BC%A5%EB%CA%FD%CB%A1(Ubuntu%209.04) 回复

(12-28 10:30)
1. XiaJing: 否则会出现 HTTP Status 404 The requested resource () is not available. 的错误 (12-28 10:35) 回复
2. XiaJing: Opengrok对中文的显示还是乱码，有待解决。 (12-28 10:36) 回复
3. XiaJing: 源文件的中文为GB编码，用OpenOffice等软件将其转换为UTF8就可正确显示。 (12-28 10:59) 回复
4. XiaJing: /var/lib/tomcat6/webapps/source/WEB-INF/web.xml (01-01 10:44) 回复
5. XiaJing: /var/opengrok/etc/configuration.xml (01-01 10:44) 回复
6. XiaJing: property="sourceRoot" (01-01 10:45) 回复
XiaJing: Code Navigation of Eclipse CDT: Outline View, Project File Views, Open declarations, Open definitions. 回复

(12-26 20:15)
XiaJing: source insight, cscope, Source navigator, www.lemis.com/grog/software/source-code-navigation.php, 回复

(12-26 17:46)
1. XiaJing: OpenGrok --Sun Microsystems (12-26 18:09) 回复
XiaJing: Don't use the keyword extern to create an external definition; use it only to refer to an existing external definition. 回复

(12-24 11:37)
1. XiaJing: Duration:Automatic, static (12-24 11:43) 回复
2. XiaJing: Scope: Block, File (12-24 11:43) 回复
3. XiaJing: Linkage:None, External, Internal (12-24 11:44) 回复
4. XiaJing: C language (12-26 20:17) 回复
XiaJing: ubuntu9.04的synaptic package manager里有eclipse CDT,但9.10里没有, 9.10需要从eclipse里安装CDT.打开eclipse->help->Install new software... ,work with 是要选择一个download site。回复

(12-21 16:44)
1. XiaJing: 新建一个指向download.eclipse.org/releases/galileo/的站点 (12-21 16:44) 回复
2. XiaJing: 安pydev也一样，站点选择 h ttp：//pydev.org/updates (01-12 17:26) 回复

559 1 ... ‹‹ 14 15 16 17 18 ›› ... 28

XiaJing: LPC17xx中的pin mode针对输入的状态,当pull-up时,引脚float对应1,可接开关连地,当pull-down时可接开关连电源,当repeater时,若引脚低,则pull-down,引脚高则pull-up,引脚输入移走,输入状态不变。回复

(12-20 22:30)
1. XiaJing: The PINMODE registers control the input mode of all ports. (12-20 22:31) 回复
XiaJing: "USB Design By Example"一书的作者John Hyde在其主页上表示该书不会出第3版，并不建议购买，而是推荐Jan Axelson's的 'USB Complete, Fourth Edition' 回复

(12-20 11:02)
XiaJing: HDG12864F-1或HDG12864L-6的手册内容过于简略时可以查看其驱动芯片SED1565的手册。回复

(12-19 20:00)
XiaJing: instruction cycle , sometimes called fetch-and-execute cycle, fetch-decode-execute cycle, or FDX.指令周期回复

(12-15 16:18)
XiaJing: 英文版的xp运行中文应用程序乱码问题control panel>Regional and Language Options>Advanced tab>Select a language to match the language version of the non-Unicode Programs you want to use选Chines 回复

(12-14 23:44)
1. XiaJing: 选Chinese(PRC) (12-14 23:45) 回复
XiaJing: Keil MDK 4.13与TKScope ARM V1.00不兼容，点击degug按钮时MKD退出，换用Keil MDK 3.8问题解决，可以调试。回复

(12-14 23:38)
1. XiaJing: TKscope ARM V1.00 Release 10/2009 (12-14 23:39) 回复
XiaJing: MOV R3, #(PLLCON_PLLE:OR:PLLCON_PLLC), 其中 :OR: 为armasm precedence，——ARM Compiler toolchain Using the Assembler Version 4.1->Symbols, Literals, Expressions, and Operators -> Addition, sub 回复

(12-13 16:01)
XiaJing: PLL_BASE EQU 0xE01FC080 ; PLL Base Address LDR R0, =PLL_BASE; 32位立即数0xE01FC080将存放于内存当中，地址为0x00000100,属于LPC21xx On-Chip Non-Volatile Memory 回复

(12-13 14:01)
XiaJing: 0x00000058 E59F00A0 LDR R0,[PC,#0x00A0],PC为0x00000058,R0的值在执行该指令后为PC+0x00A0+0x8即0x100为首地址的4字节的内容。为什么再加0x8,为0x100而不是0xf8？回复

(12-13 10:50)
1. XiaJing: *.com/questions/2102921/strange-behaviour-of-ldr-pc-value (12-13 10:54) 回复
2. XiaJing: It is recommended to write PC-relative expressions using labels rather than PC because the value of PC depends on the instruction set.Note *In ARM state, the value of the PC is the address of the cur (12-13 11:35) 回复
3. XiaJing: ARM Compiler toolchain Using the Assembler Version 4.1 -> Symbols, Literals, Expressions, and Operators -> Register-relative and PC-relative expressions (12-13 11:36) 回复
XiaJing: LDR PC, Reset_Addr ;将Reset_Addr指向的内存内容传给PC寄存器Reset_Addr DCD Reset_Handler;将Reset_Handler的标签地址存入内存Reset_Handler ...[instruction];标签回复

(12-13 10:14)
XiaJing: LPC头文件中，(*((volatile unsigned long *) 0xE0028000)), 指向unsigned long的指针的值为0xE0028000，整个表达式是指针指向的内容，即寄存器的内容，寄存器地址为0xE0028000。回复

(12-11 23:37)
XiaJing: RealView MDK-ARM 4.13a生成的Hex文件无法在Proteus 7.5中运行的原因是fromelf生成的Hex文件与RV MDK-ARM 3.2生成的有一点区别，主要是前者少了第一行和多了倒数第二行。回复

(12-11 17:21)
1. XiaJing: 第一行添加:0400000500000000F7，然后删除倒数第二行。 (12-11 17:24) 回复
XiaJing: ARM的LDR伪指令的作用是将32位的立即数或地址(32位)存入寄存器，因为ARM的指令为32位，所以不能在一条指令里包含32位的立即数。回复

(12-10 17:25)
XiaJing: ubuntu下启动ARM → RealView Development Suite v4.1 → RealView Debugger v4.1无反应，在shell下执行，报错error while loading shared libraries: libXm.so.3: cannot open shared object file: No such file or 回复

(12-10 10:52)
1. XiaJing: 需安装libmotif3包 (12-10 10:52) 回复
XiaJing: RVDS报错，Unhandled event loop exception No more handles (java.lang.UnsatisfiedLinkError: no swt-mozilla-gtk-3349 or swt-mozilla-gtk in swt.library.path, java.library.path or the jar file) 回复

(12-10 09:59)
1. XiaJing: ubuntu9.10下虽安了xulrunner-1.9.1但不兼容，需要安装xulrunner (12-10 10:01) 回复
XiaJing: 在ubuntu下用命令行形式编译链接源文件，需要指定include和lib路径，如armcc -I /rvdsdir/RVCT/Data/4.1/561/include/unix ... , armlink --libpath /rvdsdir/RVCT/Data/4.1/561/lib/... 回复

(12-08 15:00)
1. XiaJing: 可以设置环境变量，ARMCC41LIB=/rvdsdir/RVCT/Data/4.1/561/lib/ (12-08 15:00) 回复
2. XiaJing: ARMCC41INC=/rvdsdir/RVCT/Data/4.1/561/include/unix/ (12-08 15:01) 回复
XiaJing: 申请arm的license的时候用的无线网卡的MAC，本机是eth2，但hostid只读取eth0，这可通过修改/etc/udev/rules.d下的文件内容解决。使eth0为无线网卡。回复

(12-08 12:34)
XiaJing: arm给的评估license不好用，因为可能不适用于浮动的，需要修改，添加SERVER servername hostid 8224和DAEMON armlmd两条语句，另外对于ubuntu还需对/usr/tmp有写的权力。回复

(12-08 12:29)
1. XiaJing: RVDS (12-08 12:35) 回复
XiaJing: proteus的ARM和uclinux例子里有dungeon,MUD的前身，基于文本的游戏，可以用在教育领域。回复

(12-07 21:43)
XiaJing: 用linux的at命令实现倒计时闹钟，at now+10minutes 回车，在at>提示后输入编好的bash脚本，如启动音乐播放器等，例如输入/home/xiajing/mycrontab.sh，mycrontab.sh的内容是 gedit。回复

(12-07 14:33)
1. XiaJing: ctrl+D 结束 (12-07 14:35) 回复
2. XiaJing: bash脚本的内容是gedit --display=:0.0，或不用display参数，但前面要export DISPLAY环境变量 (12-07 14:59) 回复

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XiaJing: ubuntu下的RVDS安装，下载的RVDS有evaluation的 license.dat，需要设置flexnet的 client license，对于Linux只能是浮动的，设置变量ARMLMD_LICENSE_FILE=8224@my_server export ARMLMD_LICENSE_FILE 回复

(12-07 11:41)
1. XiaJing: 详见FLEXnet for ARM Tools License Management Guide (12-07 11:42) 回复
2. XiaJing: 可以在命令行下运行armasm测试是否设置成功，armasm会检测license. (12-07 11:43) 回复
XiaJing: AFAIR - As Far As I Remember 回复

(12-07 10:19)
XiaJing: RS232 null modem cables 回复

(12-06 23:23)
XiaJing: aMule添加多个链接，对于保存的htm源文件执行 grep -ir href=\"ed2k * >t.txt ，然后对t.txt中的多余语句进行替换。然后拷贝至aMule, Commit. 回复

(12-06 12:18)
1. HURONGLMJ: 太深奥了 (12-06 12:29) 回复
2. XiaJing: 主要是针对aMule无法响应web上的ed2k链接，所以要提取页面源文件中的多个ed2k链接。 (12-06 15:03) 回复
XiaJing: arm tool chain,www.ibm.com/developerworks/linux/library/l-arm-toolchain/index.html 回复

(12-05 11:04)
1. XiaJing: www.eetimes.com/design/embedded/4007119/Building-Bare-Metal-ARM-Systems-with-GNU-Part-1--Getting-Started (12-05 11:14) 回复
XiaJing: 国产手机的常用Arm芯片如mtk的，mt6226，不过手册不好找。回复

(12-03 20:46)
XiaJing: download ARM Evaluation, MDK413A.EXE (250,130K) Friday, October 29, 2010,Programs that generate more than 32 Kbytes of code and data will not compile, assemble, or link. 回复

(12-02 23:46)
1. XiaJing: www.keil.com/demo/limits.asp (12-02 23:46) 回复
2. XiaJing: www.embedinfo.com 英蓓特 (12-02 23:51) 回复
3. XiaJing: lpc21xx，data sheet, user manual, application notes (12-02 23:53) 回复
XiaJing: 笔记本，调节屏幕亮度，如果Fn+上下箭头不起作用，可以试试 sudo setpci -s 00:02.0 F4.B=88 回复

(12-01 14:26)
1. nicai2010: thinkpad? (12-01 15:18) 回复
2. XiaJing: 对，联想的 (12-01 17:05) 回复
3. nicai2010: 什么型号的？ (12-01 17:32) 回复
XiaJing: newlib 回复

(12-01 10:04)
1. XiaJing: libgloss,有startup code (12-01 10:28) 回复
XiaJing: 自制简易的示波器，www.jyetech.com 回复

(12-01 00:08)
1. XiaJing: lcd 12864 128x64 (12-01 00:13) 回复
XiaJing: 手写输入识别日韩文适用于翻译印刷品上的日韩文，youdao。回复

(11-24 12:05)
XiaJing: Springer-Remote Sensing with Imaging Radar-John A. Richards 2009 回复

(11-23 20:47)
XiaJing: processing of SAR Data: Fundamentals, Signal Processing, Interferometry 回复

(11-23 15:24)
1. XiaJing: Digital Processing Of Synthetic Aperture Radar Data: Algorithms And Implementation (Artech House Remote Sensing Library) [Hardcover] Ian G. Cumming (Auth (11-23 15:30) 回复
XiaJing: opera mobile中，点住控制键模拟鼠标右键。回复

(11-22 22:54)
XiaJing: ImageMagick，density参数可指定图片的分辨率，尤其是矢量转成位图时。convert -density 200x xj.pdf xj.gif 回复

(11-22 22:10)
XiaJing: latex中，\usepackage{geometry} \geometry{papersize={120mm,140mm}} 可以任意改变纸张大小而不用在latex命令后加参数如a4, b5等。适合单纯作图使用。回复

(11-22 21:34)
XiaJing: Python Imaging Library (PIL) ,将pdf转换为gif以适于web。回复

(11-21 00:10)
1. XiaJing: 用imagemagick (11-22 22:32) 回复
XiaJing: 电路仿真的算法。Lawrence T. Pillage, Ronald A. Rohrer, Chandramouli Visweswariah, "Electronic Circuit and System Simulation Methods“，1994 | ISBN: 0070501696 | 392 pages 回复

(11-20 23:47)
XiaJing: pgf\tikz中，\foreach \r in {0,1,...,0}将产生两个值，0和1,这样在双重循环中，\foreach \r in {0,1,...,2} \foreach \l in {0,1,...,\r} 第一个值需要在循环外实现。回复

(11-20 10:01)
XiaJing: 相位是频率与时间的乘积的前提是频率是常数，更确切的说法是相位是频率对时间的积分，如果是空间频率k，那就是k对长度u的积分。回复

(11-19 11:20)

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XiaJing: pgf/tikz中改变箭头大小。\draw[blue,decoration={markings,mark=at position 1 with {\arrow[blue,scale=2]{latex}}}, postaction={decorate}, shorten >=5pt] (XP)--(\xjx,\xjyn); 回复

(11-18 11:44)
XiaJing: pgf/tikz中提取坐标的x分量或y分量。\coordinate (XP) at ($(U)!1!atan((\xjyn-\xju)/\xjx)-atan((-\xju)/\xjx):(\xjx,0) $);\newdimen\xjxpx\pgfextractx{\xjxpx}{\pgfpointanchor{XP}{center}}; 回复

(11-18 11:39)
1. XiaJing: 可用\ifthenelse{\xjxpx > \xjxxx}{true语句}{false语句}，但\xjxxx也得用\pgfextractx/y获得。类型一致 (11-18 11:42) 回复
XiaJing: latex, animation包。<variable name> is a sequence of one or more letters without a leading back-slash1 .The first (and possibly only) letter of the variable name determines the type of the varia 回复

(11-18 09:37)
1. XiaJing: The first (and possibly only) letter of the variable name determines thetype of the variable. (11-18 09:37) 回复
2. XiaJing: There are three different types: integers (‘i’, ‘I’), reals(‘n’, ‘N’, ‘r’, ‘R’) and dimensions or LaTEX lengths (‘d’, ‘D’). (11-18 09:37) 回复
XiaJing: 两本MCU的书，Newnes_PIC Microcontrollers_know it all_Lucio Di Jasio 2008, ROGRAMMING AND CUSTOMIZING THE PIC® MICROCONTROLLER_MYKE PREDKO_2008 回复

(11-17 11:20)
XiaJing: pgf/tikz中，有时用\coordinate (E) at ($(D)!(U)!(Y)$);计算的坐标误差很大。可以掉换为(Y)(U)(D)以减小误差。回复

(11-15 16:20)
XiaJing: MATLAB中，publish("file.m")对于%%标识的cell中的多个plot只输出最后一个plot的曲线，解决的办法是每个cell只放一个plot，或使用snapnow函数。回复

(11-13 10:32)
XiaJing: tikz中, dash pattern=on 2pt off 3pt on 4pt off 4pt, dash phase=10pt, loosely dotted,dotted,densely dotted, loosely dashed,dashed, densely dashed. 回复

(11-12 21:45)
XiaJing: matlab中，a=－6:6,a.*(abs(a)<4)，置零操作。回复

(11-10 10:29)
1. XiaJing: numpy中也有类似操作，a=np.range(5),2*(a<3) (11-20 23:14) 回复
XiaJing: ubuntu下用eric4.3，自动补全时只要显示待选项窗口，键盘就僵住，只能用鼠标。回复

(11-09 09:32)
XiaJing: transformer hybrid,Practical Transformer Handbook: for Electronics, Radio and Communications Engineers 回复

(11-04 23:17)
1. XiaJing: Double transformer hybrid (11-04 23:17) 回复
2. XiaJing: A hybrid coil (or bridge transformer, or sometimes hybrid) is a transformer that has three windings,and which is designed to be configured as a circuit having 4 branches, that are conjugate in pairs. (11-04 23:20) 回复
XiaJing: pfg/tikz中，\draw [pattern=grid](0,0) circle(3);用xelatex编译会提示your graphic driver pgfsys-xetex.def does not support patterns，可以用pdflatex编译回复

(10-31 14:52)
XiaJing: pfg/tikz中，可以进行多次坐标变换，如多次平移：\draw [shift={(30:0.5)},shift={(\x,0)}](0,0)--(30:3); 回复

(10-29 10:25)
1. XiaJing: 不过用shift时,后面的坐标似乎不能是事先定义的如(A), (B)等。 (10-29 11:41) 回复
2. XiaJing: 可以用类似($(A)+(angle:radius)$)坐标计算解决 (10-29 11:42) 回复
XiaJing: latex,\documentclass[9pt,b5paper]{article}中的b5paper只是设定正文宽度，长度等，生成的pdf还是A4的。要设定纸张，还需在编译命令后加-papersize b5。回复

(10-27 21:47)
XiaJing: PGF/TikZ中，\draw[line join=round] ，\draw[line join=bevel] ，\draw[line join=miter] ，指定不同折点的形状。回复

(10-25 16:46)
XiaJing: pgf/tikz中，\draw [color=blue, fill=blue!20, thick,domain=-3*pi:3*pi, samples=501] plot (\x,{1.5*sin(3*\x r)/\x/3}) |-(0,0);注意color和fill的顺序不要颠倒，另外fill会把path的首尾自动连接形成闭合然后填充，所回复

(10-25 15:15)
1. XiaJing: 所以首尾要落在x轴上, plot生成path，后可加节点，如|-(0,0) (10-25 15:17) 回复
XiaJing: beamer中，\usepackage[table]{xcolor}会报错，解决的办法是\documentclass[xcolor=table..]{beamer} 回复

(10-24 10:31)
1. XiaJing: \rowcolors{<starting row>}{<odd color>}{<even color>} (10-24 10:31) 回复
2. XiaJing: % Enter this in the cell you wish to color a light grey. \cellcolor[gray]{0.9} (10-24 10:32) 回复
XiaJing: 1.McGraw-Hill (November 10, 2008)_PRACTICAL ARRAY PROCESSING Mark Sullivan.2.Array Signal Processing: Concepts and Techniques [Facsimile] [Paperback]Don H. Johnson 回复

(10-23 10:11)
XiaJing: 增量为B的模A运算的周期.设A,B为正整数且A>B,C=kB mod A, k=0,1,2,3...,则C的周期为A(B/G)/B=A/G, 其中G＝GCD(A,B).证明思路设D=A mod B,则D/G与B/G互质,推出D/G*G与B/G互质,即D与B/G互质,D/G与B互质,因此A(B/G)为A 回复

(10-22 22:50)
1. XiaJing: D/G与B互质,因此A(B/G)为A与B的最小公倍数,所以周期为A/G (10-22 22:51) 回复
XiaJing: pgf中\draw[decorate,decoration=brace](-0.2,-1.05)--(-0.2,-0.45);的brace在snake库里回复

(10-18 23:23)
XiaJing: python里的bin,hex,oct函数很方便。回复

(10-17 15:34)
1. XiaJing: 010->8, 0b10->2,0x10->16 (11-02 10:29) 回复

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XiaJing: \pgfmathparse{sin((\r) r)+1}\def\xjy{\pgfmathresult};\pgfmathparse{\r}\def\xjx{\pgfmathresult};\coordinate (y) at (\xjx, \xjy) ;\fill[red] (y) circle (2pt); 回复

(10-17 10:58)
1. XiaJing: 前者\xjy将指向\xjx (10-17 10:59) 回复
XiaJing: \def \foo [#1]#2% {The first argument is ``#1''. The second one is ``#2''} 其中%的作用是避免空格回复

(10-17 10:50)
XiaJing: pgf/tikz中数值变量\x \y \a等不能正确转换成字符串，例程中的坐标刻度标签的绘制就是用数值坐标和字符串标签的两组变量。可以用\def\var{\pgfmathresult}保存变量。回复

(10-17 10:01)
1. XiaJing: 不过以下语句可行。\foreach \x in {0,1,...,14} \draw (\x/2 ,0) node[anchor=north] {$\x$}; (10-17 10:22) 回复
2. XiaJing: \def\var{\pgfmathresult}保存的变量估计是地址引用 (10-17 10:34) 回复
3. XiaJing: \def\var{\pgfmathresult}连续定义两个变量则前者与后者相同 (10-17 10:38) 回复
XiaJing: ubuntu的ttf字体的安装非常简单，只需要把ttf文件拷贝到$HOME/.fonts文件夹里就可以了，然后在Openoffice里就可以看到新的字体，fontspec也可以使用。用fc-cache也可以。回复

(10-16 09:59)
1. XiaJing: Artech House_Fast and Efficient Algorithms in Computational Electromagnetics_Weng Cho Chew 2000.djvu (10-16 10:27) 回复
XiaJing: ubuntu下压缩的中文名称的文件夹无法用winrar解压。回复

(10-13 23:32)
1. XiaJing: Artech House_EW101_A First Course in Electronic Warfare_David Adamy 2001 (10-13 23:51) 回复
2. Hello_Miss: 可以选择压缩的格式阿 (10-15 18:03) 回复
3. XiaJing: 用的zip格式,为了兼顾手机只能用zip打包. (10-16 09:56) 回复
XiaJing: pgf/tikz中可以用ifthen包进行条件编译，如newcommand里的参数，\ifthenelse{\equal{#1}{0}}，这里用到\equal{string}{string}，还有\isodd{ number } \isundefined{ command name }等回复

(10-12 17:21)
XiaJing: \newcommand{\xjrc}[1]{ \begin{tikzpicture}\draw (0 ,1) node[anchor=south] {$#1$};\end{tikzpicture}}\begin{animateinline}[...]{12}\multiframe{20}{ifd=1+1}{\xjrc{\ifd}}\end{animateinline} 回复

(10-12 16:17)
1. XiaJing: ifd=1+1,要求是整数，如果ifd=0.1+0.1报错 (10-12 16:18) 回复
2. XiaJing: 如果希望显示变化的小数文字，则只能逐个传，\xjrc{0.1} \newframe;\xjrc{0.2} \newframe; (10-12 16:21) 回复
3. XiaJing: www.texample.net/tikz/examples/animated-distributions/就是这么实现的 (10-12 16:22) 回复
XiaJing: pgf/tikz中，变量一般都用在坐标中，其改变可以通过节点，如\node (a) at (\r+0.1,0.1){};或者\pgfmathparse{2pt+3.5pt} will set \pgfmathresult to the text 5.5 回复

(10-12 10:01)
XiaJing: xelatex首先将tex文件编译成xdv文件，然后转换成pdf文件，转换通过xdvipdfmx程序回复

(10-11 16:57)
1. XiaJing: xdvipdfmx为xetex项目的一部分 (10-11 17:13) 回复
XiaJing: beamer中使用animate package，用xelatex编译无显示，用pdflatex编译有错误，用latex->dvips->ps2pdf编译正常。回复

(10-11 11:56)
1. XiaJing: pdflatex也正常了，有时需要清除一下零时文件。 (10-11 16:47) 回复
2. XiaJing: 更新animate.sty到2010,xelatex也不能正常编译 (10-11 16:48) 回复
3. XiaJing: 要想使用中文只能用CJK包了，在beamer中要使用CJKutf8包。 (10-11 22:47) 回复
4. XiaJing: 使用ftp://cle.linux.org.tw/pub2/tex/cjk/fonts/里的字体，然后用pdflatex编译 (10-11 22:51) 回复
5. XiaJing: 这是用fontforge转换TTF而生成的Type 1 字体 (10-11 22:55) 回复
XiaJing: symbian里的zip管理器无法打开linux里压缩zip文件，而用winrar压缩的zip文件就可以打开。回复

(10-10 17:16)
1. XiaJing: 在linux用zip -r zipfile directoryname就可以在symbian里打开。 (10-10 17:30) 回复
2. XiaJing: 应该说是无法打开用Archive Manager 的create archive菜单生成的zip文件 (10-10 17:41) 回复
XiaJing: wget -r -l depth URL可以批量下载，很方便，回复

(10-10 16:24)
XiaJing: docs.google.com被fengsuo了，连正常的使用都不行，技术上达不到针对性的屏蔽，就不管好坏都屏蔽，这是不对的，不过用hosts文件设个ip可以解决该问题。回复

(10-09 15:24)
XiaJing: Multirate signal processing for communication systems Harris, Fred. (Fredric J.) TN911.72/9 1 外文普通书第五书库回复

(10-08 10:43)
1. XiaJing: Digital signal processing : principles, algorithms, and applications Proakis, John G. TN911.72/5-2 1 外文普通书第五书库 (10-09 12:06) 回复
XiaJing: latex的条件编译如何包括\documentclass的选项，如\documentclass[12pt,t,handout]{beamer}和\documentclass[12pt,t ]{beamer}，待解决。回复

(10-03 11:22)
XiaJing: latex设置行间距interline spacing,\setlength{\baselineskip}{28pt},实际行间距为\baselinestretch×\baselineskip，可以设置\renewcommand{\baselinestretch}{factor} 回复

(09-30 09:55)
XiaJing: latex中设置页眉为n/m页。\usepackage{fancyhdr} \usepackage{lastpage} \pagestyle{fancy} \fancyhead[L] { } \fancyhead[R]{第\ \thepage\ 页／共\ \pageref{LastPage}\ 页} 回复

(09-30 09:51)
XiaJing: beamer中的\setbeamercolor{颜色}{fg=..,bg=..!..!..}中的..!..!..可以与RGB关联，即，\definecolor{xjc1}{rgb}{0.6,0.6,.85} \setbeamercolor{xjcbutton}{fg=white,bg=xjc1} 回复

(09-28 22:43)
1. XiaJing: \definecolor{name}{model}{specs} (09-28 22:44) 回复
2. XiaJing: 详见xcolor的manual关于rgb,hsb,cmyk的model的说明 (09-28 22:48) 回复
XiaJing: beamer中用beamercolorbox代替不太灵活的button，\setbeamercolor{颜色}{fg=..,bg=..!..!..} \hyperlink{...}{\begin{beamercolorbox}[ht=..,wd=..,shadow=..,rounded=..]{颜色}按钮文字 \end{beamercolorbox}} 回复

(09-28 18:02)
XiaJing: beamer中，includegraphics的图片希望更宽一点，充分利用slide空间，向左可以用hspace{-1em}可以越过左边距，然后设置width使其更宽，但如果超过了右边距会引起自动换行并且左对齐左边距，hspace设置失效。回复

(09-28 10:14)

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XiaJing: numpy, a=np.arange(4), str(a)将整个数组转换为string,如果希望逐元素的转换可以使用a.astype(str). 回复

(09-27 23:16)
1. XiaJing: 不过如果是负数和小数，则只显示负号和整数部分。（待解决） (09-27 23:44) 回复
2. XiaJing: b=np.array([]) for i in a: b=np.append(b,str(i)) (09-27 23:46) 回复
XiaJing: Altera IP megafunctions do not require license files, but IP MegaCore do. 回复

(09-21 17:12)
XiaJing: 昨天下载了10.0sp1_modelsim_ase_linux.sh, 今天准备用昨天注册的帐号下个windows的ModelSim-Altera Starter Edition，可是不管怎么选都是10.0sp1_modelsim_ae_windows.exe，而不是ase。回复

(09-21 16:57)
XiaJing: 用GIMP制作不规则锯齿边表示撕开的效果用于对程序界面的一小部分作演示，用free select tool。然后copy,paste as new image,加阴影则用fuzzy select tool选择锯齿边外的透明部分,然后invert，filter-light and shadow-dr 回复

(09-21 09:42)
1. XiaJing: filter->light and shadow->drop shadow (09-21 09:43) 回复
XiaJing: altera quartus II 10.1 web edition的linux安装文件10.0sp1_quartus_free_linux.sh里没有modelsim-Altera Starter Edition，这与www.altera.com/literature/po/ss_quartussevswe.pdf里标注的对于modelsim为included不回复

(09-20 13:26)
1. XiaJing: 该web edtion和starter edition在ubuntu 9.04里可以工作。 (09-20 13:28) 回复
2. XiaJing: ss_quartussevswe.pdf里对于modelsim在web edition里的标注的为included，不对，需单独下载。 (09-20 13:29) 回复
XiaJing: XCircuit is a UNIX/X11 (and Windows, if you have an X-Server running, or Windows API, if not) program for drawing publishable-quality electrical circuit schematic diagrams and related figures, and pro 回复

(09-19 11:44)
1. XiaJing: 输出为postscript格式 (09-19 11:45) 回复
XiaJing: Electric is a sophisticated electrical CAD system that can handle many forms of circuit design, 回复

(09-19 11:34)
XiaJing: gnome的gconf-editor,app-panel-applets-clock....可以控制桌面时间显示的格式，比如增加秒数。回复

(09-17 10:42)
XiaJing: latex中，在tabular环境中enumerate希望实现每个格一个item,这样可以有多列item，但报错，不可行，若使用multicol包，则只能竖着排序。希望能实现两列横着Z字形排序，待解决。回复

(09-15 11:00)
XiaJing: 用鼠标多了，肩膀疼。所以现在换个姿势用鼠标，用脚操作鼠标，右肩可以放松一下了，用了两分钟，滚轮和右键也分得清了。就是鼠标一定要结实，因为被踩得嘎吱响。回复

(09-14 20:06)
1. XiaJing: 多用键盘快捷键，比如Alt+F1,Alt+F2等 (09-15 09:19) 回复
XiaJing: acrobat reader中可以用alt+left返回跳转前的一页，这样就回到了beamer中用\hyperlink{nonlinearformula}{\beamerbutton{nonlinearformula}}设置跳转的页面。回复

(09-12 11:33)
XiaJing: latex中，em指当前字体M的宽度，但对于用fontspec指定了中文字体的情况，em的宽度为中文字体的宽度一般为两个M的宽度，如\hspace(5em)会空5个汉字和10个M的宽度。回复

(09-11 15:43)
XiaJing: latex中使并列的图片顶端对齐， \parbox[t]{4cm}{\vspace{0pt}\includegraphics[ width=4cm]{./1.png} } \parbox[t]{4cm}{ \vspace{0pt} \includegraphics[width=4cm]{./2.png}} 回复

(09-07 23:53)
XiaJing: \usepackage{enumerate} \setlength{\leftmarginii}{2mm} \begin{enumerate} \item 信号的数字生成 \vspace{-3mm} \hspace{15mm} \begin{enumerate}[{4}.1] \end{enumerate}\end{enumerate}，两个enumerate加[ ]则回复

(09-06 11:44)
1. XiaJing: 有[{4}.1]则\setlength{\leftmarginii}不起作用 (09-06 11:45) 回复
2. XiaJing: 第一层设为itemize 解决该问题 (09-06 11:46) 回复
XiaJing: 用hyperref包的pdf选项指定pdf属性，如：\usepackage[pdftitle={Schedule of SDR COURSE},pdfauthor={Xia Jing}]{hyperref} 回复

(09-06 00:03)
XiaJing: latex中，\cline{2-6} { \vspace{-1.5cm} \hspace{.1cm} \parbox{0.5cm}{参考书}} 合并第一列的两行并通过设置较窄的parbox使其中的文字竖排。\rotatebox{90}{）} \\ 讲义 \\ \rotatebox{90}{（}得到横过来的括号。回复

(09-05 00:18)
1. XiaJing: 可用\raisebox{lift}[height][depth]{text}，但无法指定宽度而竖排 (09-05 00:19) 回复
XiaJing: latex 中，\newcommand{\xjheight}{\rule[-5mm]{0mm}{10mm}}设置tabular的高度。 \makebox[width][s]{ },s的作用是使后面的文字自动展开并左右对齐，适合于表格中。回复

(09-04 21:58)
XiaJing: latex中，\usepackage{layout}和\layout可以显示“页面设置”的图例，包括1 one inch + \hoffset 2 one inch + \voffset 3 \oddsidemargin = 0pt 4 \topmargin = 17pt 5 \headheight = 12pt 6 \headsep = 25pt 7 回复

(09-04 16:23)
1. XiaJing: 可以用 \setlength{\evensidemargin}{1.5cm}设置这些参数的值 (09-04 16:24) 回复
XiaJing: 草纸－>手写－>数字化(单色)－>提交－>web发布回复

(09-04 10:15)
XiaJing: 抓取pdf里的图,如果是位图, acrobat reader就可复制，如果是矢量图，一种方法是用acrobat抽取含图的页，然后crop该页，存为pdf格式(暂未测试)，另一种方法就是截图，pdfeditor的功能很有限，截图时有时只能截取一部分。回复

(09-03 11:41)
1. XiaJing: 用GIMP读取pdf文件，然后转换成位图就比较好用。 (09-03 11:41) 回复
2. XiaJing: 用convert，（ImageMagick） (12-07 11:45) 回复

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XiaJing: bash里的IFS, Internal Field Separator。python字符串的长度用len 回复

(08-27 14:04)
1. XiaJing: python中可以用str.split()分隔字符串 (08-27 14:11) 回复
XiaJing: latex中，\centering 要与换行符\\一起使用。因为要确定插入的句子或图像等的长度。回复

(08-25 21:52)
XiaJing: 放大器的级联是累乘的概念，而放大器的噪声模型是加性的，噪声温度为Te，噪声功率为kTeB(输入匹配)，与输入信号功率无关，噪声系数是比值，F＝(T0＋Te)/T0，级联的噪声系数是通过噪声温度计算。回复

(08-25 17:10)
1. 张坤: 加点分！！ (08-25 17:26) 回复
2. xixi最美: 专业人士呀 (08-25 20:38) 回复
3. XiaJing: 不敢当，只是个老学生 (08-25 21:41) 回复
XiaJing: Ulrich L. Rohde的书，The Design of Modern Microwave Oscillators for Wireless Applications 2005；RF/Microwave Circuit Design for Wireless Applications 2000；回复

(08-22 20:58)
1. XiaJing: Communications Receivers: DPS, Software Radios, and Design, 3rd Edition 2000 (08-22 20:59) 回复
2. XiaJing: Microwave Circuit Design Using Linear and Nonlinear Techniques 2005 (08-22 21:01) 回复
3. XiaJing: Communications Receivers 1997 (08-22 21:01) 回复
4. XiaJing: Microwave And Wireless Synthesizers: Theory And Design (08-22 21:03) 回复
XiaJing: bash中，分号;的作用是将几个命令合在一起遇到回车后执行。反斜杠在回车符号之前，单引号中反斜杠不转义，如同python字符串前的r，双引号中反斜杠转义。echo 'a \return b‘和echo “a \return b" 回复

(08-21 16:41)
1. XiaJing: python的单双引号没有区别，都转义，需要原始字母时用r, 即raw. (08-21 16:46) 回复
XiaJing: login shell 需要读取/etc/profile, ~/.bash_profile, ~/.bash_login.profile。该shell为交互的(interactive)。交互的nonlogin shell读取/etc/bashrc, ~/.bashrc。非交互的shell不读以上文件，但继承变量。回复

(08-21 15:49)
1. XiaJing: 允许用户输入命令的为交互，运行脚本的为非交互。 (08-21 15:51) 回复
2. XiaJing: A practical guide to linux by Mark G. Sobell (08-21 15:56) 回复
XiaJing: s60的putty不支持中文，没法ssh用emacs写有中文的东西，有UTF-8选项，但缺字库，待解决。回复

(08-21 15:18)
XiaJing: bash中，export后的变量会将变量值传给子进程的环境。没有export的变量在子进程不存在，重设改值后不影响父进程。赋值后export或export vname=vvalue都可回复

(08-21 15:08)
XiaJing: Python的BaseHTTPRequestHandler的self.path指的是域名后的路径，如127.0.0.1/则self.path为/，若127.0.0.1/t.png则为/t.png。os包里的curdir一般为“."，sep为“/"。回复

(08-20 21:08)
1. XiaJing: 用python实现了一个简单的Http server，省得安apache了 (08-20 21:16) 回复
XiaJing: 将pdf转换成png以便在浏览器里看，convert -density 300 -resize 600 xjbeamersdr-RF.pdf[0] t.png，转换pdf的首页为t.png。回复

(08-20 18:04)
XiaJing: 尝试poppler-utils里的pdftohtml，效果不理想，矢量图无法转换，格式都不对。回复

(08-20 17:08)
XiaJing: 安了tex4ht和hevea，希望能将tex(beamer)转换成html格式，未果。前者需要dvi，xelatex -no-pdf 生成XDV (extended DVI) ，后者Cannot open file: beamer.hva，no base style 回复

(08-20 16:56)
XiaJing: linux的at命令实现临时闹钟，固定闹用cron，at -f /home/xiajing/mybatch now + 20 minute ，mybatch内容：export DISPLAY=:0.0 \n totem ~/mp3 回复

(08-19 15:37)
XiaJing: 在GIMP处理后的图像需要flatten后再插入到beamer中，否则在Acrobat Reader中显示的颜色不正常。去掉图层。回复

(08-19 11:14)
XiaJing: beamer中使用textpos包和textblock environment实现tikzpicture箭头等图形的任意位置annotation. 回复

(08-19 10:30)
XiaJing: beamer的framezoom 用xelatex编译无border区域，用pdflatex编译正常，待解决回复

(08-18 23:30)
XiaJing: beamer按钮问题，hyperref={xetex}, \documentclass[hyperref= list of options ]{beamer} Causes the list of options to be passed on to the hyperref package.Ex: \documentclass[hyperref={bookmarks=false}]{bea 回复

(08-18 22:27)
XiaJing: continued fraction or partial fraction expension 回复

(08-18 16:36)
1. XiaJing: network synthesis, image impedance analysis, SAW, BAW(Bulk Acoustic Wave) (08-18 17:10) 回复
XiaJing: H:\GNURadio\USRP\USRP at 33\USRP_REV_3 回复

(08-17 16:15)
XiaJing: asymptote对数组越界赋值不同于python，however, assignment to an element beyond the length of the array causes the array to be resized to accommodate the new element。回复

(08-17 11:43)

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XiaJing: 两个基本一致的空心线圈的电感计算公式，L=0.001*N^2*r^2/(228r+254l),l为长度，r为线圈半径，N为匝数。L＝(d^2*N^2)/(l+0.45d),l为长度，d为线圈直径，N为匝数。回复

(08-17 10:37)
1. XiaJing: info.ee.surrey.ac.uk/Workshop/advice/coils/air_coils.html (08-17 10:38) 回复
2. XiaJing: www.qsl.net/in3otd/indcalc.html (08-17 10:39) 回复
3. XiaJing: 前者为亨，后者为微亨 (08-17 10:41) 回复
XiaJing: gnucap的ckt文件的第一行是说明注释。回复

(08-16 17:52)
XiaJing: linux下的spice ，bwrc.eecs.berkeley.edu/Classes/IcBook/SPICE/，最高版本3f5编译安装时需要手动设定参数。Ngspice，deb包需要xspice，ubuntu仓储没有。Gnucap started by Albert Davis[1] in 1993。回复

(08-16 16:35)
XiaJing: 波导和微带的ring hybrid叠加和抵消的方式是不同的，波导lambdaG/2叠加，微带lambdaG/2抵消。www.tpub.com/neets/book18/80f.htm 回复

(08-16 11:02)
XiaJing: matplotlib中，plt.xlabel("$\phi=0^\circ,\ 180^\circ $}")第一个0和圆圈过近的问题可以通过\hspace{2}解决。回复

(08-14 17:55)
XiaJing: matplotlib中，对于绘制极坐标用的pylab里的ax.set_rmax()可以用ax.set_ylim(min,max)替代。回复

(08-14 16:55)
1. XiaJing: plt.axis()，ax.setyticks()，ax.setyticklabels() (08-14 17:22) 回复
XiaJing: latex里没有\degree，可以用^\circ。回复

(08-14 11:11)
XiaJing: asy中，> string s="tex";> write("$"+s+"$") 输出$tex$字符串可以用instert也可以用加号。回复

(08-14 10:26)
XiaJing: asy中，currentprojection=orthographic(0,0,0.1);zaxis3("$z$",-1,2,blue,InTicks(Label,3,2,endlabel=false),Arrow3);只要有inTicks则"$z$"不会在(0,0,2)附近，而是大概在(0,0,4)附近，待解决。回复

(08-14 00:18)
XiaJing: asymptote中，XY()*"$z$"，XY()代表转换到XY平面，即使标签z放在XY平面，详见three包。回复

(08-13 22:23)
1. XiaJing: yaxis3("$y$",0,1,red,OutTicks(2,2));ticks详见graph包，两个2指主刻度和子刻度个数 (08-13 22:34) 回复
XiaJing: matplotlib中，axes.annotate( .... , blackgroundcolor='white')，避免受grid影响。回复

(08-13 20:41)
XiaJing: numpy的tostring()是根据ASCII码的二进制码显示，如np.array([65]).tostring()将会显示一个A，如果希望显示65则使用str。回复

(08-13 12:07)
XiaJing: asymptote中绘图的尺寸是根据图像自动适合的，这对于2维图很好，3D图则根据初始视角所看的图像尺寸自动缩小，旋转后就出界了，所以3D图一般需要正方形的画布，如何在asymptote中指定画布大小(待解决) 回复

(08-13 09:50)
1. XiaJing: 不过导出的prc可以用movie15指定画布大小 (08-13 09:50) 回复
2. XiaJing: draw(box(( , , ), ( , , ,)),invisible); (08-13 09:51) 回复
3. XiaJing: 而且现在还无法将u3d和prc合并在一起，如天线和三维方向图。 (08-13 21:08) 回复
XiaJing: asy -f pdf -k XX.asy, -k,-keep Keep intermediate files [false].包括prc 回复

(08-12 21:50)
XiaJing: 在asymptote里，real r=0;int ir=0;for(int i=35;i<55;++i) { r=11.0-2.0^(-i); ir=(int)r; write("r:",(string)(r)," ir:",(string)ir);} 得到的是r显示为11时,ir却为10,所以有时用(int)ca 回复

(08-12 10:27)
1. XiaJing: 所以有时用(int)cast时,会有误差,可用round解决 (08-12 10:28) 回复
XiaJing: 解决xelatex编译通过movie15嵌入的u3d/prc无显示，选用asymptote提供的movie15_dvipdfmx.sty, \usepackage[3D,dvipdfmx]{movie15}使用dvipdfmx选项。回复

(08-10 15:34)
1. XiaJing: 编译时在命令行执行，有错时回车，忽略错误 (06-17 17:48) 回复
XiaJing: 问题：xelatex编译u3d,无显示。偷梁换柱实现xelatex编译u3d，修改-*.tex将其中的prc换成u3d，不过3D的封面还是prc对应的，旋转后是U3D的，封面待解决。回复

(08-10 00:18)
1. XiaJing: -*.pdf就是封面 (08-10 00:20) 回复
2. XiaJing: xelatex编译嵌入到asy里的u3d (08-10 09:42) 回复
XiaJing: xelatex对movie15支持不太好，xelatex编译的用movie15嵌入的U3d,prc的tex文件，无3D图。用pdflatex编译就有3D图。回复

(08-09 23:59)
XiaJing: fontspec包可以在asymptote里（包括3D）嵌入中文回复

(08-09 23:34)
XiaJing: tex可以用movie15嵌入u3d（pdflatex），tex中未能用asymptote嵌入u3d。回复

(08-09 23:25)

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XiaJing: beamer中插入asy 3D后编译错误： ! Undefined control sequence.<argument> \the \pdflastobj l.13 ...\ASYprefix ...prc ，回车、回车、回车，不要用C+z 回复

(08-09 16:52)
XiaJing: asy -f pdf *.asy， asymptote可以直接生成3D的pdf文件，而且可以和latex一起使用，包括xelatex和pdflatex，不过与beamer不兼容(待解决)，\includegraphics{*.pdf}导入asy的3D的pdf不能保持3D状态，而成为平面图形。回复

(08-08 21:52)
XiaJing: 编译安装asymptote所生成的手册asymptote.pdf居然是用户定制的，也就是说手册不会用$HOME通用的表述，而是用/home/xiajing/，有意思。回复

(08-08 19:48)
XiaJing: TEXMFHOME=/home/xiajing/texmf，把asymptote安到自己的空间，不使用root安装，即安到/home/xiajing/texmf/tex/latex/asymptote，这里tex/latex是规范的目录结构，省略为/home/xiajing/texmf/asymptote，系统不认。回复

(08-08 17:22)
1. XiaJing: 在/home/xiajing/texmf执行texhash更新ls-R库 (08-08 17:25) 回复
2. XiaJing: kpsewhich asycolors.sty ，得到文件具体位置 (08-08 17:25) 回复
XiaJing: texconfig , tex的gui配置程序。回复

(08-08 16:17)
XiaJing: 初看asymptote，觉得似乎比pgf功能要多，至少3D的demo很有特色。回复

(08-08 10:45)
XiaJing: 根据asymptote.sourceforge.net/doc/embed.html，从asymptote.svn.sourceforge.net/viewvc/asymptote/trunk/asymptote/patches/ 上更新了movie15.sty，回复

(08-08 10:42)
1. XiaJing: patch文件用patch命令patch (08-08 10:46) 回复
XiaJing: HFSS,empro,cst的3D模型可以导出成sat或stp等格式，然后用DE转成u3d。再用pdflatex转，如用xelatex编译则无显示，待解决中... 回复

(08-08 00:38)
XiaJing: cst 2008安装后，要先用update manager打补丁，然后再patch，不行再patch。回复

(08-08 00:09)
1. XiaJing: 不然会有feature do not match 错误 (08-08 00:31) 回复
XiaJing: 买来的豆浆喝着有点苦，但前几天买的超市自己做的豆浆就不苦，不知道是什么原因，有的说是卤水，有的说是变质，初步的结论是这不应是黄豆的本味，还是不喝的好。回复

(08-07 09:31)
1. XiaJing: 以后不喝甜豆浆，不然喝了变质的苦豆浆也感觉不到。 (08-07 09:34) 回复
XiaJing: mfi=matplotlib.font_manager.FontProperties(size=11),fig.legend( , , prop=mfi,handletextpad=0.1)设置图例字体大小并设置线条和文字间隔为文字大小的0.1。回复

(08-05 22:50)
XiaJing: numpy的array的view()对应base的数据，但shape可以更改与base不同，所谓shallow copy。numpy的array的copy()即deep copy。回复

(08-05 17:04)
XiaJing: [[1,2],[1,2]]，numpy.array.flatten('C')或numpy.array.flatten('F')，前者行为主，结果为[1,2,1,2]，后者Fortran模式列为主，[1,1,2,2]。回复

(08-05 16:45)
XiaJing: matplotlib中调整边距使用fig=plt.gcf()fig.subplots_adjust(bottom=0.2)，这样可以有地方加入较复杂的数轴标签。回复

(08-05 09:56)
XiaJing: matplotlib里的xticks的属性同text，如verticalalignment，rotation等，也可以用latex如$\pi$，不过$2\pi$和$\pi$因2和pi不等高导致$2\pi$和$\pi$不能对齐，用verticalalignment='baseline'效果也不理想回复

(08-04 23:48)
1. XiaJing: 底对齐还要让rc文件里的xtick.major.pad大一点，否则ticks标签会压在坐标轴上。 (08-05 09:36) 回复
XiaJing: \includegraphics[]{}中的文件名可以包含相对路径，但文件名要求有扩展名，并且除去扩展名前的点(.)不能再有点，如"e2.23.pdf"则会报错。回复

(08-04 23:42)
XiaJing: crontab -e, 编辑定时执行的脚本。回复

(08-04 20:33)
XiaJing: beamer中的云朵形状的标注(callout, pull quotes)的实现可以通过tikz的shapes库里的callout和textpos包实现，后者实现任意位置放置。回复

(08-04 12:12)
XiaJing: xetex无法正确编译pgf的pattern，提示：Your graphic driver pgfsys-xetex.def does not support patterns.只能用pdflatex，再\includegraphics 回复

(08-03 23:13)
XiaJing: 用latex的array组织一个多行多等号的公式时为了使两列距离靠近，也就是使等号与两边符号的间隔不要太大，可以用\setlength\arraycolsep{15.4pt} 回复

(08-03 21:11)

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XiaJing: latex数学环境中不能有空行，否则会报错。回复

(08-03 17:06)
XiaJing: csv (comma-separated values) 文本数据库文件 ; 希望能有svg(Scalable Vector Graphics) 与pgf 以及tex与htm的方便转换。回复

(08-03 09:14)
XiaJing: xetex中，公式中要显示中文用\mbox{} 回复

(08-02 16:12)
XiaJing: 用firefox上某网站由于该网站有个链接无法连上导致整个网页被卡住无法显示，通过阻止该链接所指网站解决该问题，1路由器里设置IP过滤，(无效)。2修改hosts文件(linux里是/etc/hosts)，(解决)。回复

(08-01 18:10)
XiaJing: texmakerx比texmaker功能多很多，包括自动补全，大量界面元素方案的配置。回复

(07-31 17:47)
XiaJing: 两个\footnote 的标号之间的逗号可以用\raisebox{6pt}{,}实现。复杂的footnote可以用footmisc包。回复

(07-31 17:26)
XiaJing: pgf中，无法通过类似 (intersection number of firstobject and second object ) 的语句得到bezier曲线与其他曲线的交点(intersection)，只能\draw[smooth] plot coordinates{(-1.5,1) (-1, 回复

(07-29 18:17)
1. XiaJing: 只能\draw[smooth] plot coordinates{(-1.5,1) (-1,2) (0,1)}先确定交点 (07-29 18:17) 回复
XiaJing: pgf作矢量图很强大但周期长，有些图只能选OpenOffice Draw作，导出成pdf，然后插入beamer里。OpenOffice Presentation的公式不是很好用。回复

(07-29 14:47)
XiaJing: Tikz中，Use \colorlet to define a new color based on an old one. \colorlet{lightgray}{black!25}。specify a new color using \definecolor. \definecolor{orange}{rgb}{1,0.5,0} 回复

(07-29 14:44)
XiaJing: beamer中，1. \setbeamercolor {description item}{fg=red}，使description的item为红色。2. 定义自己的环境myblock类似内嵌的exampleblock，definition等，其中\setbeamercolor{local structure}{fg=green}，使嵌入的itemize 回复

(07-26 18:10)
1. XiaJing: 使嵌入的itemize前的符号颜色为green。 (07-26 18:11) 回复
2. XiaJing: 可以与myblock的标题的背景颜色一致。 (07-26 18:12) 回复
XiaJing: beamer中，\pause {\onslide \color<-.>{blue}先蓝后黑} 中的文字"先蓝后黑"先蓝后黑，一个trick是可以使字体为很浅的灰色，投影仪打不出来但显示器能显示，即先灰后黑，这里没有用序号所以前面任意加\pause 回复

(07-25 22:31)
XiaJing: pgf语句\node (dot) [terminal] {.}; \node (digit) [terminal,right=of dot] {digit}; 可能产生错误：! Package PGF Math Error: Unknown function `of'. 通过添加语句\usetikzlibrary{positioning}解决。回复

(07-24 21:00)
XiaJing: pgf中指定交点，\draw[very thick,orange] (1,0) -- (intersection of 1,0--1,1 and 0,0--30:1cm); 回复

(07-24 15:55)
XiaJing: pgf中： \draw (5,0) -- ++(1,1) -- +(2,0) arc (0:230:2cm); ，++(1,1)的参考点为(5,0)，+(2,0)的参考点是(6,1)，arc的参考点是(8,1)，弧所在圆的圆心为(6,1)。回复

(07-24 11:29)
1. XiaJing: +(2,1)的参考点受是否有++控制，arc的参考点对应前一个位置。 (07-24 11:30) 回复
XiaJing: pgf uses Uwe Kern’s xcolor package 回复

(07-24 10:31)
XiaJing: ():Parentheses (singular, parenthesis)—also called simply brackets (UK), or round bracket. [ ]:Square brackets—also called simply brackets (US). { }:Curly brackets—also called braces (US). 回复

(07-24 10:04)
XiaJing: \begin{frame}[t]{Top alignment} ,\begin{frame}[c]{Center alignment (default)},\begin{frame}[b]{Bottom alignment} ,全局\documentclass[t]{beamer} 回复

(07-23 22:05)
XiaJing: beamer中，通过\newenvironment定义自己的统一标题样式。回复

(07-23 17:47)
XiaJing: grep命令，Context Line Control： -A NUM, --after-context=NUM ： Print NUM lines of trailing context after matching lines. Places a line containing a group separator (--) between contiguous group 回复

(07-23 17:23)
XiaJing: 美陆军头盔上能放到眼前的设备是Helmet Mounted Display或image intensified night vision system 回复

(07-23 15:37)

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XiaJing: xelatex编译beamer时，beamer中的button和framezoom不起作用，用pdflatex编译时才起作用。回复

(07-23 11:09)
XiaJing: linux服务管理程序rcconf，可以通过ssh运行，包括手机上的ssh。回复

(07-23 09:31)
XiaJing: beamer中，\setbeamertemplate{frametitle}[default][center]，选取outer theme default，并设置frametitle居中，查看beamerouterthemedefault.sty得frametitle含于beamercolorbox，可用\setbeamercolor设置。回复

(07-22 21:40)
XiaJing: beamer中，\setbeamercolor*{frametitle}{fg=white,bg=blue!50!black}设置的是标题背景和前景色。回复

(07-22 20:50)
XiaJing: 在beamer中，\vspace{-2cm}可以使对象向上移动2cm。回复

(07-21 18:22)
XiaJing: beamer中，在”\centering 居住的中文字体“语句后回车紧接着是\end{frame}则不会居中，解决的办法是于\end{frame}隔一行，或在语句加两个反斜杠\\表示换行再回车加\end{frame}。回复

(07-21 18:11)
XiaJing: beamer和PGF/Tikz的项目主持者都是Prof. Dr. Till Tantau，www.tcs.uni-luebeck.de/en/mitarbeiter/tantau/ 回复

(07-21 17:19)
XiaJing: xetex不支持中文的粗体，如使用\bfseries对中文字库不起作用。回复

(07-21 14:24)
1. XiaJing: 补充：版本This is XeTeXk, Version 3.141592-2.2-0.996-patch2 (Web2C 7.5.6) (07-21 15:22) 回复
XiaJing: beamer自动载入xcolor包，\color{green!40!yellow})指40%的绿色和60的黄色，回复

(07-21 14:23)
XiaJing: beamer中，\begin{beamercolorbox}[ht=2.5ex,dp=1ex,center]{title in head/foot}，其ht设置（文字底端向上的）高度，dp设置（文字底端向下的）深度，ex为额外距离。回复

(07-20 23:09)
XiaJing: 在beamer里，命令\setbeamertemplate{navigation symbols}{}将抑制所有导航符回复

(07-20 17:56)
XiaJing: latex里的自动换行不会把英文单词随意拆开，而是根据空格换行，例如当输入一个网址时，整个网址中没有空格，就会当成一个单词跳到下一行。对于中文没有空格，所以英文的换行方法不适用，xetex里对中文自动换行先设置回复

(07-20 14:59)
1. XiaJing: xetex里对中文自动换行先设置\XeTeXlinebreaklocale "zh" 和 \XeTeXlinebreakskip = 0pt plus 1pt (07-20 14:59) 回复
2. XiaJing: \XeTeXlinebreakskip 则是让 XeTeX 可以在字元间加入 0pt～1pt 的弹性间距 (07-20 15:00) 回复
XiaJing: Use meshlab，LATEX，movie15 package，acrobat reader to embedded U3D object in a pdf and view it. 回复

(07-20 08:37)
XiaJing: TikZ and PGF examples, www.texample.net/tikz/examples/ 回复

(07-19 23:55)
XiaJing: 设置不同标题的颜色，\setbeamercolor{titlelike}{fg=red!80!black,bg=red!20!white}，\setbeamercolor{block title }{fg=red!80!black,bg=red!20!white} 回复

(07-19 23:33)
1. XiaJing: 或\setbeamercolor*{titlelike}{fg=red!80!black,bg=red!20!white} (07-22 20:37) 回复
XiaJing: 1. Computer Modern (CM) fonts, The AMSFonts distribution is composed of two parts: the Computer Modern (CM) fonts, and the original AMSFonts. 2. The Latin Modern(LM) fonts are derived from the famous 回复

(07-19 21:49)
1. XiaJing: The Latin Modern fonts are derived from the famous Computer Modern fonts designed by Donald E. Knuth and first published by the American Matematical Society (AMS) in 1997 (07-19 21:50) 回复
XiaJing: 1. xetex加beamer中，\usepackage[cm-default]{fontspec}，如无[cm-default]，则\[\alpha, \beta, \gamma, \delta,\]无法显示。2. \usepackage{euler}，euler是一个使用AMS Euler字体的包。回复

(07-19 21:29)
XiaJing: 1. "en.wikibooks.org/wiki/LaTeX" 2. the Computer Modern Typewriter font (cmtt) are gotten by default when using \ttdefault, \ttfamily, \texttt 3. www.cl.cam.ac.uk/~rf10/pstex/latexcommands.h 回复

(07-19 17:33)
1. XiaJing: 3应为www.cl.cam.ac.uk/~rf10/pstex/latexcommands.htm (07-19 17:35) 回复
2. XiaJing: ****的bug，1,2,3不足200字，但将3补足和1,2一起发布，3却不完整，显示不了200字 (07-19 17:37) 回复
XiaJing: 在beamer中输入中文，先去掉\inputenc和\fontenc，改用xetex里的\usepackage{fontspec}，回复

(07-18 22:14)
1. XiaJing: the German word Beamer, a pseudo-anglicism for video projector. (07-20 09:07) 回复
XiaJing: linux里用file命令查看文件信息，$file /usr/bin/pdftex/usr/bin/pdftex: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, stripped 回复

(07-18 21:10)

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XiaJing: 注意tex, latex, xetex, xelatex四个可执行文件，latex和xelatex增加了宏，常用。回复

(07-18 13:58)
XiaJing: 在linux里检查sha256校验码用sha256sum，类似的命令还有sha1sum sha256sum sha512sum sha224sum sha384sum shasum 。回复

(07-18 13:40)
XiaJing: xetex(zee-tech)提示:LaTeX Error: File `xkeyval.sty' not found. 在“packages.ubuntu.com“查得xkeyval.sty文件属于texlive-latex-recommended包。回复

(07-18 11:59)
XiaJing: emacs里用C-x C--和C-x C-+ 命令分别缩小和增大字体。回复

(07-17 09:23)
XiaJing: cat -n file1 > file2可以将file1的每一行前加上序号存为file2 回复

(07-14 17:39)
XiaJing: GIS数据源和普通数据源的区别－－它带有空间信息。GDAL和PIL等图像处理库的最大区别也就在此处。回复

(07-13 18:04)
XiaJing: GDAL - Geospatial Data Abstraction Library . OpenGIS® is a Registered trademark of the Open Geospatial Consortium, Inc (OGC) and is the brand name associated with the Standards and documents. 回复

(07-13 17:38)
XiaJing: PIL, The Python Imaging Library adds image processing capabilities to your Python interpreter. 回复

(07-13 17:04)
XiaJing: 用shell下的emacs编辑python，C-x 2打开两个窗口，C-x o在两个窗口间切换，M-`启用菜单(如有ibus要关闭或删除ibus的Alt+grave快捷方式)，选择python->Start interpreter，这样可得到C-c C-c的输出结果。回复

(07-13 15:37)
XiaJing: 可用emacs的Rectangles功能进行多行python代码的注释、删除和缩进。C-@选择标记起点，即方块文字区的左上角，然后移动光标到方块文字区的右下角，选定方块区后就可以C-x r t String<RET>了，String可以是＃或TAB等。回复

(07-13 11:24)
1. XiaJing: 删除注释可以用C-x r k或C-x r d，前者可用C-x r y复原。 (07-13 11:24) 回复
2. XiaJing: 在python模式下选择一段文字，M-; 可以实现注释与删除注释 (07-13 11:54) 回复
XiaJing: audio_alsa_sink[hw:0,0]: Device or resource busy可能是flash音乐播放器所致，通过关闭浏览器的所有窗口解决。回复

(07-12 23:10)
XiaJing: aplay和arecord是linux下回放和录制声音的命令行程序，arecord t.wav命令将录制的声音存为t.wav，aplay -l可以显示声卡信息。回复

(07-12 22:11)
XiaJing: suxwigb和suximage都有个参数perc，其作用是截取所占比例大于perc的数值，使得灰度显示不会被少数的大信号干扰，如：suximage perc=99.3 < ozdata3.25 回复

(06-27 17:29)
1. XiaJing: perc在suximage,suxwigb帮助里没有，但在xwigb里有，可以通过sufind查到。 (07-01 12:24) 回复
XiaJing: "www-geo.phys.ualberta.ca/~sacchi/" 回复

(06-27 11:40)
XiaJing: http://hi.****.net/!s/KBPJLUseismic imaging 回复

(06-27 11:40)
XiaJing: "www.geofys.uu.se/?q=view/overview/12" 回复

(06-27 10:34)
XiaJing: http://hi.****.net/!s/OUI97H,course website of seismic imaging. 回复

(06-27 10:33)
XiaJing: 在Matplotlib的polar坐标下绘制曲线图，对于grid的操作函数有，matplotlib.pyplot.xticks和yticks设置grid，还可以用matplotlib.pyplot.rc('grid', color='#316931', linewidth=1, linestyle='-') 回复

(06-22 13:22)
XiaJing: MATLAB对Axes对象的ticks的操作非常有限，不支持tex，TickLabel是string，所以ticklabel字体的设置不是单独的，而是通过Axes的fontsize属性设置。回复

(05-03 17:37)
XiaJing: 手机现在的信号强度满格,查询显示为73dBm,约为50.12pW 回复

(05-01 10:20)
1. XiaJing: 补充:移动的GSM网络 (05-01 10:27) 回复
2. XiaJing: 现在为76dBm约为25.12pW (05-02 13:19) 回复

559 1 ... ‹‹ 24 25 26 27 28 ››

XiaJing: opera mobile 10 不支持MATHML 回复

(04-18 23:08)
XiaJing: 安装Sideralis2.0B630,基于java的在手机上显示星座图的软件,设置所在位置坐标,以度为单位精确到小数点后两位就可。在手机或电脑的google map上输入坐标可定位地点,反之,在没有具体信息的地方点击map返回的就是坐标。回复

(04-18 17:19)
XiaJing: 纬度变化0.001度约等于110米,经度变化0.001度约等于100米,很粗略的估计.如果地球是严格的圆球面，二者应该相等。回复

(04-18 17:05)
XiaJing: 删除手机自带的“行学一族”和“大众点评”。回复

(04-13 21:32)
XiaJing: 用emacs时,C-z只是挂起当前emacs,要结束需要键入C-x C-c,要是察看是否有程序挂起或后台执行,键入命令ps。可以使用%emacs恢复,当多次键入emacs执行,多次C-z,则会有多个emacs,可通过fg 1或fg 2等恢复第1或第2个emacs。回复

(04-09 18:28)
XiaJing: 用emacs编辑python代码时,点击TAB键,无缩进,伴有Sole indentation的显示是因为可能有语法错误,如在for语句结尾没有冒号":"。回复

(04-09 17:49)
XiaJing: 电脑,手机文件互传若干方法.1.有线:usb连接线,minSD读卡器;2.无线:蓝牙(速度慢,PC也需有蓝牙),WLAN(http,ftp,dav),安装APACHE和vsftp,dav远程驱动器适合双向传输大量文件(copy folder),http适合单向传大文件,如500M 回复

(04-09 12:00)
XiaJing: symbian自带的adobe reader有时候打开pdf文件时无文字显示，有acrobat把该pdf文件再打印一下基本就能解决问题回复

(04-09 11:39)
XiaJing: 在symbian系统里当把一个文件夹里的近1400个小文件拷贝到另一文件里时，如果只拷贝了1000个，当第二次在拷贝时会提示文件已存在是否覆盖，可以选择否，不过那就得按1000次了，因为没有以后按此操作的选项。回复

(04-09 11:35)
1. XiaJing: 长按功能键调出任务，选择复制的任务，按删除键，强行关闭程序 (04-09 11:37) 回复
XiaJing: 用ssh登录系统运行python导入matplotlib.pyplot，然后绘图，python抛出错误，解决办法在程序前加入语句：matplotlib.use('Agg')，然后存为图形文件回复

(04-08 22:25)
1. XiaJing: 既设置backend(相对于frondend)为图形文件输出 (04-08 22:31) 回复
XiaJing: 在pys60的手机环境编写Module，然后存于E:\Data\PYTHON里，在其他文件里调用该Module提示无法找到该Module，该问题可通过添加'e:\\Data\\PYTHON'到sys.path解决。回复

(04-07 10:13)
XiaJing: 将Quickoffice5升级为6.2.217(en,无cn),本想看看是否能输入公式,结果不但不支持公式,C盘还少了8M多,E盘有16G也没用,尝试删除,提示无法删除,需要所谓硬格复原. 回复

(04-03 16:25)
XiaJing: python里list变量复制时复制的是地址。如>>>a=[2,3]>>>b=a>>>b[0]=9>>>print a输出是[9,3] 回复

(04-03 09:06)
XiaJing: PyS60里的help函数的输出信息有时真的很少，如>>>a=graphics.Image.new((20,20))>>>help(a.line)结果是built-in function line:line(...) 回复

(04-02 17:26)
XiaJing: PyS60里的字符串需要为UNICODE，>>>s=u"Hello"以及>>>n=5>>>s2=unicode(n)可输入或转成unicode字符回复

(04-02 11:51)
XiaJing: 用Pys60就可以实现屏幕截图，只需graphics模块和e32的Ao_timer()生成的延时对象。回复

(04-01 22:42)
XiaJing: 迷你博客是不是没有普通博客有的搜索功能。回复

(03-28 18:03)
XiaJing: 电子书的格式最常见的有pdf,chm,djvu等，这些格式各有所长，pdf适合打印，djvu适合扫描的书，chm适合作为手机阅读，不过先要转换为htm格式，“hh -decompile 目的名 chm文件 ” 回复

(03-28 17:05)
XiaJing: 用我的Symbian和Opera mobile 10 通过WLAN输入。不过最好先用记事本或其他本地文本编辑器编辑，再拷贝过去，刚才直接在网页上编辑，错按了返回，结果输入被清空。回复

(03-28 11:24)

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