采用MATLAB中的延时函数pause：
Halt execution temporarily
使用方法：
pause
pause(n)
pause on
pause off
函数描述：
pause, by itself, causes M-files to stop and wait for you to
press any key before continuing.
pause(n) pauses execution for n seconds before continuing, where
n can be any nonnegative real number. The resolution of the clock
is platform specific. A fractional pause of 0.01 seconds should be
supported on most platforms.
pause(inf) puts you into an infinite loop. To return to the
MATLAB prompt, type Ctrl+C.
pause on allows subsequent pause commands to pause
execution.
pause off ensures that any subsequent pause or pause(n)
statements do not pause execution. This allows normally interactive
scripts to run unattended.