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From: =?UTF-8?Q?Hans-Bernhard_Br=c3=b6ker?= <HBBroeker@t-online.de>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: GnuPlot problem from C ++
Date: Thu, 22 Apr 2021 23:13:11 +0200
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Am 22.04.2021 um 16:45 schrieb Ulul� Ulul�:

> When I start the program the graph of f(x) does not respect the
> information provided to Gnuplot with the string "Frase": for example
> the command "unset key" it is not respected as well as the "set grid"
> command. Why?
Because the pieces of your command string are in the wrong order.  You 
put the cart before the horse.

You should really begin by using gnuplot manually for a bit, before you 
go ahead trying to drive it from another program.