in reply to
Re: How to declare variables per loop
in thread How to declare variables per loop
My comment is about your Perl Module installation.
You can use local::lib and install Perl Module in your home directory. Write the appropriate code using GnuPlot module. Show it to your manager to ask the sys-admin to install that for you in the appropriate directory. Your problem can be more general to lot of people and there has to appropriate solution which gives more freedom to developers and hence better CPAN for all of us.