Re: [Matplotlib-users] pcolor

[Wendell C. <wcr...@uf...>]

Thanks very much. Setting clim(0.0, 1.0) inside the loop stabilized the
color mapping.

Wendell Cropper


At 02:58 PM 11/30/2004 -0600, John Hunter wrote:
>>>>>> "Wendell" == Wendell Cropper <wcr...@uf...> writes:
>
>    Wendell> I have been trying to use pcolor() to display a grid with
>    Wendell> discrete values (1-4) that are changing over time. I'm
>    Wendell> generating a series of saved figures that also include a
>    Wendell> line graph of the sums of the 4 categories. The problem
>    Wendell> is that that mapping of numbers to colors isn't constant
>    Wendell> for the pcolor output. I changed the array from Float32
>    Wendell> (used out of habit) to integer and got the same type of
>    Wendell> result. It would also be nice to be able to use the same
>    Wendell> color mapping for both sub plots.
>
>    Wendell> I think (guess) that cmap=cm.jet controls the color
>    Wendell> scheme, but it isn't clear to me how to change that, what
>    Wendell> format it has, or why it seems to change with repeated
>    Wendell> calls to pcolor() inside the program.
>
>It sounds to me like the color limits are being autoscaled with each
>call to pcolor.  cm.jet does define the color map, but the color
>limits define the range of your data that correspond to the min and
>max of the colormap.
>
>See help(clim)
>
>If after each call to pcolor, you manually set the clim, you should
>have no problems.
>
>JDH
>
>
>
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