[Octave-bug-tracker] [bug #53215] plot3 with empty arguments does not set the return plot handle

[Rik]

Update of bug #53215 (project octave):

                Severity:              3 - Normal => 1 - Wish               
                Priority:              5 - Normal => 3 - Low                
              Item Group:        Unexpected Error => Matlab Compatibility   

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Follow-up Comment #1:

I'm marking this as "Matlab Compatibility" and lowering the priority as there
are many, many workarounds.

As a start, a typical way is to embed a special condition for the first frame
in the animation.


for i = 1:num_frames
  ... calculate data ...
  if (i == 1)
    ## First frame, use plot to create figure and axes
    h = plot3 (xdata, ydata, zdata);
  else
    ## Update data to refresh plot with new animation frame
    set (h, "xdata", xdata, "ydata", ydata, "zdata", zdata);
  endif
endfor


Alternatively, use throwaway data since it is just going to be overwritten


h = plot3 (0,0,0);
for i = 1:num_frames
  ... calculate data ...
  ## Update data to refresh plot with new animation frame
  set (h, "xdata", xdata, "ydata", ydata, "zdata", zdata);
  endif
endfor


If for some reason the data really, really needs to be null at the start then
you can make it so by passing property/value pairs in the plot3 call.


h = plot3 (0,0,0, 'xdata', [], 'ydata', [], 'zdata', [])




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