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From: Ethan A Merritt <EAMerritt@gmail.com>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: variable in plot command and key
Date: Mon, 09 Jan 2017 21:59:51 -0800
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Karl Ratzsch wrote:

> Am 09.01.2017 um 17:50 schrieb Jörg Buchholz:
>> 
>> 
>> Is there a way to use a variable as data file name and have the
>> default key entry?
>> 
> 
> You mean you want to see the actual file name + the actual "using"
> specifier"? I think not, at least not directly.
> 
> You could write the whole plot command into a string and execute it
> with "evaluate"
> 
>   fname = "'test_1.dat'"
>   eval "plot ".fname." us 1:2"

Or slightly simpler:

   foo = "'test_1.dat'"
   plot @foo using 1:2

To suppress interpretation of underscores in the plot key

   set key noenhanced

I don't think there is currently a way to maintain enhanced text
markup in the key titles while not having it replace underscores in file names.

  Ethan