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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: For loop not working as I expected - but now solved
Date: Mon, 19 Feb 2018 16:11:04 +0100
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Am 19.02.2018 um 15:22 schrieb Chris Elvidge:

> I put it down to my misreading (i.e. not fully understanding what is 
> going on) of this (first example) where 'plot [-10:10]' is used; 'for' 
> is not mentioned:
> 
> http://gnuplot.sourceforge.net/demo_svg_5.0/simple.html


The full syntax for plot iteration is this:

  plot {[xmin:xmax] {[ymin:ymax]}} for [i=a:b] F(x)

, where everything in curly brackets is optional. Try

  plot [-2:2] [-5:10] x**2

against

  plot for [i=0:3] x**i

xmin,xmax,ymin,ymax just give the length of the axes, while iteration
needs the "for" keyword.