You can also take a look at the wiki
http://www.scipy.org/Cookbook/Matplotlib/ColormapTransformations
There you'll find the code I had about colormap discretization. Maybe it
does the same thing Eric discussed, however.
Cheers,
David
2007/2/6, Eric Firing <[EMAIL PROTECTED]>:
Claas Teichmann wrote:
> Hi David and Eric,
>
> one year ago, you discussed a discretazation of the colorbar with
> imshow() in matplotlib-users. The topic was "DIscretization of
> colorbar". Did you succeed in using a discrete colorbar?
Yes, I completely rewrote the colorbar code, and it is now quite flexible.
>
> I put a request to the mailinglist with the topic "Wrong
> colorbar-ticks in imshow-colorbar with 10 colors". Maybe one of you
> already got the answer?
>
> Many greetings!
>
> Claas :-)
Assuming you have a reasonably recent version of mpl, you can modify
your colorbar call this way:
colorbar(ticks=linspace(im.norm.vmin, im.norm.vmax, 11))
(This is for your example with a 10-entry colormap.)
Because of a default parameter that is not exposed, it will label only
every second color boundary in the example from your earlier message.
To make it label every boundary, you could use
from matplotlib import ticker
ticks = linspace(im.norm.vmin, im.norm.vmax, 11)
tickmaker = ticker.FixedLocator(ticks, nbins=20)
# make nbins >= number of ticks
colorbar(ticks=tickmaker)
Eric
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