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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: consistency of function .vs. data plotting
Date: Mon, 25 Jun 2018 23:55:44 +0200
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Am 25.06.2018 um 16:06 schrieb Karl Ratzsch:
> 
> As a workaround, you could do sth like following
> 
>    f(x) = ...
>    plot "+" us 1:(imag(f(x) =0 ? f(x) : NaN)
> 

should of course read

   plot "+" us 1:(imag(f(x))==0 ? f(x) : NaN)