[Octave-bug-tracker] [bug #55570] quiver3 gives error for 3 inputs

[Mike Miller]

Follow-up Comment #2, bug #55570 (project octave):

I don't think the 3-argument form is Matlab compatible, however, after looking
at https://www.mathworks.com/help/matlab/ref/quiver3.html.

The Octave documentation seems like it is simply describing the interface
incorrectly. There is no 3-argument form, and the 6-argument form requires
x,y,z to have the same dimensions as u,v,w, so they cannot be the output of a
3-nargout call to meshgrid.

There is a 4-argument form that is not documented in Octave's doc string at
all, where X and Y are implied and Z defines the surface on which the vector
field is plotted.

So going back to the example in Octave's doc string, this should not be
expected to work:


[x, y, z] = peaks (25);
[u, v, w] = surfnorm (x, y, z / 10);
quiver3 (u, v, w);


But this *should* work, and currently fails in Octave:


quiver3 (z, u, v, w);


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