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From: Ethan A Merritt <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Plotting data array as variable (not in files)
Date: Tue, 06 Sep 2016 15:22:47 -0700
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xlrotor@gmail.com wrote:

> Absolutely brilliant!
> 
> I just used it to get contour labels on a contour plot of a nonuniform
> matrix data file.  I was about ready to give up on this.
> 
> Here's the gist of it.
> X="0.1 0.2 0.3 0.4 0.5"
> Y="-1  0   2   4   8"
> set multiplot
> splot 'dfile' matrix u (0+word(X,int($1+1))):(0+word(Y,int($2+1))):3 with lines 
> splot 'dfile' matrix u (0+word(X,int($1+1))):(0+word(Y,int($2+1))):3 with labels

I do not see anything here that would require multiplot.


Have you looked at the on line demos for contouring nonuniform data?

 http://gnuplot.sourceforge.net/demo_cvs/scatter.html