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Newsgroups: comp.graphics.apps.gnuplot
Date: Thu, 2 Aug 2018 18:35:52 -0700 (PDT)
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Subject: Re: Set plot title from datafile?
From: rowlesmr@gmail.com
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Xref: csiph.com comp.graphics.apps.gnuplot:4028

On Friday, 3 August 2018 00:44:38 UTC+8, Ethan Merritt  wrote:
> 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

Thanks Ethan

Is it possible to set the title as a particular columnhead? eg the third one? I could do some preprocessing to put the string I want into that position.

Matthew