Alan G Isaac wrote:
> On Fri, 11 Apr 2008, Eric Firing apparently wrote:
>> It sounds like what you want is a listed colormap with direct indexing 
>> using a NoNorm() instance as the norm:
> 
>> cmap = mpl.colors.ListedColormap(['k', 'r', 'b'])
>> norm = mpl.colors.NoNorm()
>> matshow(aa, cmap=cmap, norm=norm, interpolation='nearest')
> 
> Perfect!
> 
> I actually had found ListedColormap in the docs.
> It's name was very promising but the __init__ function had 
> no help.  Can I suggest adding at least the following:
> 
>         `colors` is a sequence of Matplotlib colors.
>         `name` is a string (a name assigned to this colormap).

Good point.  I have added a docstring.  In the process I did a little 
checking, found a bug (only for the odd case where N is specified and is 
less than the length of the list of colors), and fixed it.

> 
> Seems obvious in retrospect, but of course that's too late ...
> 
> By the way, how is the name attribute used?

I'm not sure whether it is actually being used by anyone, but having a 
name attribute for each colormap could make it easier manage a set of 
colormaps.

Eric

> 
> Thanks,
> Alan

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