[Matplotlib-users] plot_wireframe

[Patton B. <pat...@at...>]

Just trying to get familiar with mplot3d's functions, and I've run into a problem with plot_wireframe that I'm having problems running down (or duplicating, for that matter).  I'm trying to generate plots of some wavelet functions, so I need to plot values against time and scale.  I've generated three numpy arrays: X (time), Y (scale) (generated these using meshgrid), and Z (values, a rather sparse matrix).  I verified that all of these are the same shape (7x100) by fetching the 'shape' attribute from X,Y,Z.   However, when I call plot_wireframe(), I get this error:
 
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python26\lib\lib-tk\Tkinter.py", line 1410, in __call__
    return self.func(*args)
  File "C:\Python26\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 212, in resize
    self.show()
  File "C:\Python26\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 215, in draw
    FigureCanvasAgg.draw(self)
  File "C:\Python26\lib\site-packages\matplotlib\backends\backend_agg.py", line 314, in draw
    self.figure.draw(self.renderer)
  File "C:\Python26\Lib\site-packages\matplotlib\artist.py", line 46, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "C:\Python26\lib\site-packages\matplotlib\figure.py", line 773, in draw
    for a in self.axes: a.draw(renderer)
  File "C:\Python26\lib\site-packages\mpl_toolkits\mplot3d\axes3d.py", line 135, in draw
    for col in self.collections]
  File "C:\Python26\Lib\site-packages\mpl_toolkits\mplot3d\art3d.py", line 163, in do_3d_projection
    self._segments3d]
  File "C:\Python26\lib\site-packages\mpl_toolkits\mplot3d\proj3d.py", line 211, in proj_trans_points
    return proj_transform(xs, ys, zs, M)
  File "C:\Python26\lib\site-packages\mpl_toolkits\mplot3d\proj3d.py", line 193, in proj_transform
    vec = vec_pad_ones(xs, ys, zs)
  File "C:\Python26\lib\site-packages\mpl_toolkits\mplot3d\proj3d.py", line 184, in vec_pad_ones
    vec = np.array([xs,ys,zs,np.ones((len(xs)))])
ValueError: setting an array element with a sequence.
 
Any suggestions as to what the problem might be?  As I said, I'm having problems duplicating it in "toy" programs.
 
Thanks in advance.
 
/s/
Pat