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Groups > comp.graphics.apps.gnuplot > #4044

Re: Substract value from contour line to surface

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Am 18.09.2018 um 07:08 schrieb laterite@laposte.net:
> Le lundi 17 septembre 2018 22:25:51 UTC+2, Hans-Bernhard Bröker a écrit :
>> Am 17.09.2018 um 17:17 schrieb laterite@laposte.net:

>>> Now, I would like to plot the surface of the function G(x,y0)-G(x0,y0).

>> How isn't that the exact same surface as G(x,y) itself?  You've just
>> renamed the second independent variable and subtracted a constant zero!
> 
> 
> Sorry, my bad, I made a mistake in my explanation :
> 
> I have an analytical 2D function G(x,y) and a .dat file giving me a subset of x0,y0 points solution of the equation dG/dx|_y=0 in a .dat file.
> 
> And no I want to plot G(x,y0)-G(x0,y0)
> 

One key problem is that that isn't actually a surface.  It's a set of 
curves over x; one for each point (x0,y0) from your data set.

In total, it's more like a volumetric function f(x,x0,y0), sampled in a 
somewhat strange way.

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Substract value from contour line to surface "laterite@laposte.net" <hematitefr@gmail.com> - 2018-09-17 08:17 -0700
  Re: Substract value from contour line to surface Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2018-09-17 22:25 +0200
    Re: Substract value from contour line to surface "laterite@laposte.net" <hematitefr@gmail.com> - 2018-09-17 22:08 -0700
      Re: Substract value from contour line to surface Karl Ratzsch <mail.kfr@gmx.net> - 2018-09-18 07:46 +0200
        Re: Substract value from contour line to surface "laterite@laposte.net" <hematitefr@gmail.com> - 2018-09-18 00:36 -0700
          Re: Substract value from contour line to surface Gavin Buxton <gavinbuxton@gmail.com> - 2018-09-18 07:34 -0700
          Re: Substract value from contour line to surface Karl Ratzsch <mail.kfr@gmx.net> - 2018-09-18 17:43 +0200
      Re: Substract value from contour line to surface Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2018-09-18 20:11 +0200

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