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Re: Can contour surface model be saved to file?

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On Jun 17, 1:52 am, Bengt T <bengt_tornqv...@hotmail.com> wrote:
> I have a contour plot (meshed surface) build from file with x-, y- and
> z-coordinates and wish to save the mathematical model, generated by
> gnuplot, in some way. The goal is to use the model to generate z-
> coordinate from new x- and y-coordinates.
>
> Example of input file (x, y, z):
> 1 1 1
> 1 2 2
> 1 3 3
> 2 1 2
> 2 2 4
> 2 3 1
> etc.
>
> After saving the model I wish to be able to generate z-coordinate for
> any x-/y-coordinates within the surface. For example, x=1.8 and y=1.4.
>
> Is it possible to save the model generated in a plot or are there any
> other suggestions?

Hi Bengt!

You can always use the "save" command which saves userdefined
functions, variables, the set term status, all set options, or all
of these, plus the last plot (splot) command to the specied file
with the save command and later reload them with the "load" command.
All according to the manual at http://www.gnuplot.info/docs_4.4/gnuplot.pdf

To the best of my knowledge, you would have to use a suitable 2-
dimensional function, then fit with the fit command as described in:
http://gnuplot.sourceforge.net/demo_4.4/fit.html

This was you can use the function with the generated fit parameters to
later get a z value for any given x and y.

There might be other ways as well, but then beyond my (somewhat
limited) knowledge.

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Thread

Can contour surface model be saved to file? Bengt T <bengt_tornqvist@hotmail.com> - 2011-06-16 22:52 -0700
  Re: Can contour surface model be saved to file? Johan B <johan.barne@gmail.com> - 2011-06-17 03:07 -0700
    Re: Can contour surface model be saved to file? Bengt T <bengt_tornqvist@hotmail.com> - 2011-06-17 09:08 -0700
  Re: Can contour surface model be saved to file? Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-06-17 21:26 +0200
    Re: Can contour surface model be saved to file? Bengt T <bengt_tornqvist@hotmail.com> - 2011-06-19 00:37 -0700
      Re: Can contour surface model be saved to file? Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-06-19 16:00 +0200
        Re: Can contour surface model be saved to file? Ingo Thies <ingo.thies@gmx.de> - 2011-06-19 21:30 +0200
          Re: Can contour surface model be saved to file? Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-06-21 00:12 +0200
            Re: Can contour surface model be saved to file? Ingo Thies <ingo.thies@gmx.de> - 2011-06-21 16:00 +0200

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