替换文本文件中的第n行

How do I go about in replacing the nth line of a text file in R?

如何更换R中文本文件的第n行?

2 个解决方案

#1

To replace the third line of this:

要替换第三行:

$ cat junk.txt
sic transit
gloria mundi
temeo danoas
et dona ferentes

Do this:

> latin = readLines("junk.txt",-1)
> latin[3]="per ardua ad astra"
> writeLines(latin,"junkout.txt")

and get:

$ cat junkout.txt 
sic transit
gloria mundi
per ardua ad astra
et dona ferentes

You can writeLines(latin,"junk.txt") and overwrite the input file if you want.

如果需要,您可以writeLines(拉丁语,“junk.txt”)并覆盖输入文件。

#2

I don't know if there is an option to change a specific line in the streaming file (seek in file), although you have the option to read the file , change a column and write the the frame to a file, read, write functions supply you what you need.

我不知道是否有选项可以更改流文件中的特定行(在文件中搜索),尽管您可以选择读取文件,更改列并将帧写入文件,读取,写入功能为您提供所需的功能。

You may also use read.table() to read the file into a table format, change specific row and then write.table()

您也可以使用read.table()将文件读入表格格式,更改特定行然后再写入.table()

you have options like read.csv() and write.csv() and many other options like readLines().

你有read.csv()和write.csv()等选项以及readLines()等许多其他选项。

EDIT

Here is a wiki link for file handling in R

这是R中用于文件处理的wiki链接

#1