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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: plot number variable
Followup-To: comp.graphics.apps.gnuplot
Date: Thu, 31 May 2012 09:19:04 -0700
Organization: gnuplot development team
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tom wrote:

> Dear all,
> I ws wondering if there was the possibility (it night already exists) to
> have a variable (a GPVAL_PLOTNUM) with the current plot being plotted when
> plotting several files or functions altogether. I try to explain better:
> when I plot several files like plot 'file1', 'file2', sin(x)
> I would like to have a variable that is 0 for the plot associated to file1
> and 1 for file2 and 2 for sin(x) so on, so that I can use it to do
> something like
> 
> plot 'file1' u 1:2:(GPVAL_PLOTNUM) w l palette, 'file2' u
> 1:($2+GPVAL_PLOTNUM):(GPVAL_PLOTNUM) w l palette, sin(x*GPVAL_PLOTNUM)
> 
> what do you think?

As far as plotting multiple files, this is already supported.
Using your example above:

gnuplot> filename(i) = 'file'.i
gnuplot> plot for [i=1:2] filename(i) u 1:(column(2+i-1)):i w l palette


However mixing in a function that uses the same indexing is strange. 
Is this a real-world requirement?





> would it be easy to implement?
> could you give me a hint on the source files I have to look at to do some
> test?
> 
> many many thanks