[Matplotlib-users] can't use custom color maps

[Dr. Phillip M. Feldman]

I'd like to be able to create and use a custom colormap.  I'm creating the
colormap via
the following statement:

matplotlib.colors.ListedColormap([(0,0,0),(0.6,0,0),(0,0.6,0),(0.6,0.6,0)],
  name='Earth')

The above statement appears to work, but when I attempt to use this
colormap, I
get the error shown below.  Any suggestions will be appreciated.

AssertionError                            Traceback (most recent call last)

art.py in <module>()
    253
    254 # Plot z as image using specified color map:
--> 255 pyplot.imshow(z, origin='lower', cmap=get_cmap(map_names[n_map-1]),
    256   extent=[x.min(),x.max(),y.min(),y.max()])
    257

C:\Program
Files\Python25\lib\site-packages\matplotlib-0.98.5.2n2-py2.5-win32.egg\matplotlib\cm.pyc
in get_cmap(name, lut)
     19     if lut is None: lut = mpl.rcParams['image.lut']
     20
---> 21     assert(name in datad.keys())
     22     return colors.LinearSegmentedColormap(name,  datad[name], lut)
     23

AssertionError:
-- 
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