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Newsgroups: comp.graphics.apps.gnuplot
Date: Mon, 25 Jun 2018 08:43:05 -0700 (PDT)
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Subject: Re: consistency of function .vs. data plotting
From: palme@kapott.org
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Xref: csiph.com comp.graphics.apps.gnuplot:3975


Thanks!

-stefan-


On Tuesday, 19 June 2018 18:41:20 UTC+2, pa...@kapott.org  wrote:
> Hi all,
> 
> I am quite new to gnuplot, so maybe I am just not knowing some basics.
> 
> My understanding of the documentation is that something like "plot f(x)" is equivalent to "plot '+' using 1:(f($1))". 
> 
> Of course the former uses "set style function" as default plotting style, and the latter "set style data", but that's not my point...
> 
> My issue is that if f(x)=asin(x) the result is different: plotting the pure function does NOT plot points for the complex results in the range outside [-1,1]. 
> 
> But the approach using the pseudo data file plots also points for the complex results outside the [-1,1] range.
> 
> See yourself:
>   print "using pure function"
>   plot asin(x)
>   pause -1 "press enter"
>   print "using pseudo data file"
>   plot '+' using 1:(asin($1)) with lines
>   pause -1 "press enter"
> 
> So I have two questions:
> 
> 1) Where exactly is my misunderstanding of the documentation, regarding the way how data file plotting works in comparison to plotting pure functions?
> 
> 2) How can I avoid these complex results to be plotted with the second approach?
> 
> Thanks and regards
> -stefan-