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Groups > comp.graphics.apps.gnuplot > #3972

consistency of function .vs. data plotting

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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-

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consistency of function .vs. data plotting palme@kapott.org - 2018-06-19 09:41 -0700
  Re: consistency of function .vs. data plotting Karl Ratzsch <mail.kfr@gmx.net> - 2018-06-25 16:06 +0200
    Re: consistency of function .vs. data plotting Karl Ratzsch <mail.kfr@gmx.net> - 2018-06-25 23:55 +0200
  Re: consistency of function .vs. data plotting palme@kapott.org - 2018-06-25 08:43 -0700

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