Online use of Gnuplot with PHP, Apache and Linux

[Jingzhao Ou <ja...@ya...>]

Dear all,

I installed Gnuplot 4.0 on a RedHat Linux box. It seems to be working fine from
the bash command line. 

I planned to use Gnuplot for online plotting, some thing like what is showing
on the following URL:

http://www.srcf.ucam.org/~sea31/

I ran a gnuplot script test.dem on PHP as the following:

system("gnuplot test.dem");

However, I failed to get any output from Gnuplot even though running "gnuplot
test.dem" directly in the bash command line would give me the desired result. I
tried also CGI written in Perl. I can run the Perl script on the bash command
line and generate the desired ps file. However, when I run it through CGI, I
got nothing!

I searched Google. It seems that quite some people encountered similar
problems. But I failed to find out the answers to the question.

Can any one kindly give me a hand! Thanks a lot for your help!!!

Best regards,
Jingzhao