Re: [Matplotlib-users] 3d plot examples

[Ryan K. <rya...@gm...>]

This is a common problem I have with switching code over to numpy.  If
you are in the habit of using if myMatrix: as a way to check for an
empty matrix, numpy now throws this error.  It could be replaced with
myMatrix.any(), but then I think there are problems if you use the
same code under Numeric or numarray.

Ryan

On 2/14/06, John Hunter <jdh...@ac...> wrote:
> >>>>> "J" =3D=3D J Brandenburg <J.B...@if...> writes:
>
>     J> Hi Travis, Hi list,
>
>     J> I saw Travis' query on the matplotlib-user - list and of cause
>     J> I read Fernandos reply...
>
>     J> So, I copied the three files into the matplotlib directory as
>     J> bsp_3D01.py, proj3d.py and mplot3d.py... But if I try to run
>     J> bsp_3d01.py I get:
>
> Not sure about the bsp example ...
>
> Try the following
>
>   wget http://matplotlib.sourceforge.net/mpl3d.zip
>   unzip mpl3d.zip
>   cd 3d/
>   python mplot3d.py  --Numeric
>
> There is a problem with numpy support, since when I ran the code with
> numpy I got the following
>
> Traceback (most recent call last):
>   File
>   "/home/jdhunter/debs/matplotlib/usr/lib/python2.4/site-packages/matplot=
lib/backends/backend_gtk.py",
>   line 303, in expose_event
>     self._render_figure(self._pixmap, w, h)
>   File
>   "/home/jdhunter/debs/matplotlib/usr/lib/python2.4/site-packages/matplot=
lib/backends/backend_gtkagg.py",
>   line 72, in _render_figure
>     FigureCanvasAgg.draw(self)
>   File
>   "/usr/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py",
>   line 386, in draw
>     self.figure.draw(renderer)
>   File "/usr/lib/python2.4/site-packages/matplotlib/figure.py", line
>   528, in draw
>     for a in self.axes: a.draw(renderer)
>   File "mplot3d.py", line 714, in draw
>     self.w_xaxis.draw(renderer)
>   File "mplot3d.py", line 464, in draw
>     tc =3D self.axes.tunit_cube(vals,renderer.M)
>   File "mplot3d.py", line 680, in tunit_cube
>     M =3D M or self.M
> ValueError: The truth value of an array with more than one element is
>   ambiguous. Use a.any() or a.all()
>
>
>
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