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From: Ethan Merritt <eamerritt@gmail.com>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Set plot title from datafile?
Date: Thu, 2 Aug 2018 16:44:37 -0000 (UTC)
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On Thu, 02 Aug 2018 08:02:12 -0700, rowlesmr wrote:

> How can I set the title of my plot from a string in my data file?
> 
> My data is like so:

[snip] 

> 
> and I'm plotting it with a nested for loop like so:
> 
>>set key autotitle columnhead do for [j=0:1] {
>>  do for [i=4:8] {
>>    plot 'data.txt' index j u 2:i w lp t columnhead
>>  }
>>}
> 
> I am successfully setting the key from the header information. I would
> like the title for each graph to be taken from the text string in the
> 3rd column (ie corundum or silcon_NIST). I know that this would give
> many graphs with the same title.
> 
> 
> Is this possible? If so, how can I do it?
> 
> I am using gnuplot 5.2 patchlevel 2 in Cygwin


It is not possible in 5.2

In the development version (5.3) you could do it in two steps,
which might or might not be OK in your application case:

do for [i=4:8] {
    unset title
    plot 'data.txt' index j u 2:i w lp title (FOO=columhead(i))
    set title FOO
    replot
}

	Ethan