[Octave-bug-tracker] [bug #49780] Error plotting surface with color matrix.

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?49780>

                 Summary: Error plotting surface with color matrix.
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Tue 06 Dec 2016 07:58:58 PM UTC
                Category: Plotting with gnuplot
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: John
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.0
        Operating System: GNU/Linux

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Details:

Hello!

I have found that using surf(X,Y,Z,C), with C being a color matrix does not
work when using gnuplot. The code used goes as follow:


close all; graphics_toolkit fltk

[X Y] = meshgrid(linspace(-2, 2, 100));
Z = X + i*Y;
Fz = 1./(exp(1./Z)-exp(1));

surf(X, Y, abs(Fz), cmplx_colormat(Fz))
shading interp


-The error it gives is:
error: __go_draw_axes__: invalid grid data
error: called from
    __go_draw_axes__ at line 1172 column 13
    __go_draw_figure__ at line 172 column 17
    __gnuplot_drawnow__ at line 86 column 5


Using fltk or qt it works correctly. Removing the fourth argument of surf()
also works. The color matrix consist in a NxMx3 array containing the RGB
values of every point of the MxN mesh (Fz and Z). I attach an image of the
(correct) result using qt.


Tested on Ubuntu 16.04 (64 bits), with package octave-4.0.0-3ubuntu9.1.



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File Attachments:


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Date: Tue 06 Dec 2016 07:58:58 PM UTC  Name: hey.png  Size: 263kB   By: None

<http://savannah.gnu.org/bugs/download.php?file_id=39165>

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