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Newsgroups: comp.graphics.apps.gnuplot
Date: Thu, 4 Oct 2012 19:55:59 -0700 (PDT)
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Subject: Re: Plotting data array as variable (not in files)
From: Kevin <kevin.nielson@gmail.com>
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Xref: csiph.com comp.graphics.apps.gnuplot:1398

On Tuesday, March 13, 2012 12:01:17 PM UTC-4, Petr Mikulik wrote:
> > I have hard time to understand how I can do the following.
> 
> > 
> 
> > I'm starting gnuplot with an input command file:
> 
> > 
> 
> > gnuplot -persist < inputFile.gpl
> 
> > 
> 
> > Within the inputFile.gpl I want to have two arrays X and Y as gnuplot
> 
> > variables. For instance:
> 
> > 
> 
> > Y = [0.8117, 0.944, 0.9937, 1.0145, 0.9369, 0.9574, 0.9861, 0.9484,
> 
> > 0.9891, 0.9987, 1.0485, 0.6612, 0.6899, 0.87]
> 
> > X = [817, 818, 819, 822, 823, 824, 825, 826, 829, 830, 831, 901, 902,
> 
> > 906]
> 
> > 
> 
> > I need gnuplot to plot Y(X) but I do not know how to set these arrays
> 
> > as variables within the command file inputFile.gpl
> 
> > 
> 
> > Basically, the two data arrays X, Y are not stored in external files.
> 
> > They are variables within the inputFile.gpl and gnuplot should plot
> 
> > Y(X)
> 
> > 
> 
> > Can someone please give me a hint?
> 
> 
> 
> It's a strange data set-up, but try this:
> 
> 
> 
> X="0.1 0.2 0.3 0.4 0.5"
> 
> Y="-1  0   2   4   8"
> 
> 
> 
> set parametric
> 
> set trange [1:words(X)]; set samples words(X)
> 
> plot (0+word(X,int(t))),(0+word(Y,int(t)))
> 
> 
> 
> ---
> 
> PM

This is a brilliant workaround for gnuplot not having arrays.  This snippet should be part of every gnuplot tutorial in christendom.