 # differnet colormaps with pcolormesh

Hi,

Is there a way to somehow squeeze two datasets with two different color
maps into one pcolormesh? Say one dataset occupies one triangle (e. g.
numpy.triu(dataset1, 1)) and the second dataset a different area (e. g.
numpy.tril(dataset2, -1)) and then paste the two datasets in one
pcolormesh (e.g. pylab.pcolormesh(numpy.triu(dataset1, 1) +
numpy.tril(dataset2, -1)) ). This will obviously share one colormap. But
does anybody know a trick to use two different ones?

TIA
Christian

PS Forgot to thank Eric Firing for his tip last time I asked. Thank you
Eric: You solved my problem!

I'm not exactly sure what you're trying to do. but I think what you
want can be easily achieved by simply using the masked array. Is the
example below similar to what you need?

a = np.arange(100).reshape((10,10))

m1 = np.triu(a, 1) > 0
m2 = np.tril(a, -1) > 0
#m2 = ~m1

pcolormesh(am1, cmap=plt.cm.jet)
pcolormesh(am2, cmap=plt.cm.gray)

-JJ

···

On Wed, Nov 11, 2009 at 12:11 PM, Christian Meesters <meesters@...2757...> wrote:

Hi,

Is there a way to somehow squeeze two datasets with two different color
maps into one pcolormesh? Say one dataset occupies one triangle (e. g.
numpy.triu(dataset1, 1)) and the second dataset a different area (e. g.
numpy.tril(dataset2, -1)) and then paste the two datasets in one
pcolormesh (e.g. pylab.pcolormesh(numpy.triu(dataset1, 1) +
numpy.tril(dataset2, -1)) ). This will obviously share one colormap. But
does anybody know a trick to use two different ones?

TIA
Christian

PS Forgot to thank Eric Firing for his tip last time I asked. Thank you
Eric: You solved my problem!

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