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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: How to display the value in the n-th column in the 3rd from the last row in the file on a chart?
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Date: Thu, 19 Jul 2012 07:45:52 -0700
Organization: gnuplot development team
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TonyG wrote:

> I assume gnuplot 4.6 does not have a dedicated data file line
> addressing mechanism and I would have to use a script.  So, how do I
> display a specific value copied from a specific file (generated by a
> script) on a chart (using, for example, the 'set label 1 sprintf("a =
> %3.4f", a) at 500,50' command, a situation described in the title of
> my post?



Foo = system("tail -3 filename")
Labeltext = word(Foo,N)
set label 1 Labeltext at some_x, some_y