bugGNU Octave - Bugs: bug #55713, meshc throws an error with Octave...


bug #55713: meshc throws an error with Octave 5.0.91

Submitted by:  Stephan Gebauer <stephan_ii>
Submitted on:  Thu 14 Feb 2019 08:44:33 PM UTC  
Category:  Plotting Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Regression
Status:  Fixed Assigned to:  None
Originator Name:  Open/Closed:  Closed
Release:  5.0.91 Operating System:  Any

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Thu 14 Feb 2019 10:35:59 PM UTC, comment #3: 

I pushed a simple fix on stable:


Closing report as fixed.

Pantxo Diribarne <pantxo>
Project Member
Thu 14 Feb 2019 09:49:37 PM UTC, comment #2: 

Confirmed. A simpler example is

sombrero ();
hc = colorbar ();
sombrero ();

And the "invalid handle" in the error message is the handle to the colorbar axes.

Pantxo Diribarne <pantxo>
Project Member
Thu 14 Feb 2019 08:50:19 PM UTC, comment #1: 

a small supplement, this error message also
thrown with the mesh or meshz and so on....

Stephan Gebauer <stephan_ii>
Thu 14 Feb 2019 08:44:33 PM UTC, original submission:  


i have testet a peace of code works well with Octave 4.4.1, but
gives an error message with Octave 5.00.91.

Here the Code:

N = 25;                     % frame count for the movie
[X,Y]=meshgrid(-pi:.1:pi);  % generate grid
for t=1:N
    f=cos(X-t*pi/N).*sin(Y-t*pi/N);   %  test function
    meshc(X,Y,f);                     % Plot
    title('Evolution der Funktion f(x,y,t)=cos(x-(t\pi)/N)sin(y-(t\pi)/N)');
    M(:,t) = getframe(gcf);  % Save the current Frame in M

from the second pass of the for loop the meshc(X,Y,f) cause this error message with
each pass:

error: get: invalid handle (= -64.2043)
execution error in graphics callback function
error: get: invalid handle (= -31.1792)
execution error in graphics callback function

nevertheless the code works, means M stores the frames as it should do.
Just the error is thrown in the command line.

Otave runs under Windows 10.

Hope its helpful!

Best regards


Stephan Gebauer <stephan_ii>


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    Follow 6 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2019-02-15 siko1056 Summarymeshc throws an error with Octave 5.00.91 => meshc throws an error with Octave 5.0.91
    2019-02-14 pantxo StatusConfirmed => Fixed
        Open/ClosedOpen => Closed
    2019-02-14 pantxo Item GroupUnexpected Error or Warning => Regression
        StatusNone => Confirmed
        Operating SystemMicrosoft Windows => Any

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