Dr. Phillip M. Feldman wrote:
> 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')
Assign it to a variable, like
earth_cmap = matplotlib.colors.ListedColormap(
[(0,0,0),(0.6,0,0),(0,0.6,0),(0.6,0.6,0)],
name='Earth')
and then use cmap=earth_cmap as your kwarg specification.
The ability to register user-generated cmaps so that they can be
retrieved via get_cmap is very new, and not present in 0.98.5. It is in
the latest release (0.99.1), though. You would need to use the
register_cmap function.
Eric
>
> 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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