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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: set range for second independent variable in special file '++'
Date: Mon, 27 Mar 2017 22:15:43 +0200
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Am 27.03.2017 um 08:00 schrieb Ethan A Merritt:
> Karl Ratzsch wrote:
>> Not much of a downside, but what about "+" ? Will it use trange now?
>> That's a bit strong, re backwards compatibility. ?
> 
> Good question.
> 
> Although the syntax required is not quite the same as for '++'
> you can already effectively do that like this:
> 
>     set xrange [1:100]
>     plot sample [t=10:20] '+' using (t):(sin(t))


Ja, that's definitely sufficient, and probably better than reusing the
parametric 't' variable outside of it's original scope. For "++", this

  plot sample [var1=10:20] [var2=-3:3] '++' using ...

would be my favourite (nice not having to use the cryptic $n's, ranges
can be varied for subplots), but it's probably heck to get the parser to
recognise it. One "sample" keyword demands for one following range
specifer, a second one might not be so easy to catch. ?