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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: label fontsize variable
Date: Tue, 19 Jan 2016 16:10:13 +0100
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Am 19.01.2016 um 11:46 schrieb Jörg Buchholz:
> Hello,
> 
> is it possible to change the fontsize with a variable? I want do 
> something like this:
> 
> sf=0.1 #scalefactor
> set label 1 'test' at screen 0.5,0.5 center font "Helvetica,sf*40"

You need to give the fontspec as a string variable:

fontstr = sprintf("Helvetica, %.f",sf*40)
set label  .... font fontstr