| Sorry, I attached the wrong file:
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colormap_clipping.patch
Description: Binary data
On Oct 18, 2008, at 11:23 AM, Tony S Yu wrote: I was using pcolor with very large numbers and a small vrange (vmax - vmin), and ran into a float to integer conversion problem. Large numbers get converted to *negative* integers by astype ( see numpy thread) in colors.Colormap.__call__.
I'm not sure if this is even worth fixing since almost no one would run into this problem (unless you were doing something stupid, like trying to use pcolor as a 2D zero finder :). For the error to occur, you have to set vmin/vmax values (otherwise, the data is properly normalized before converting to integers), and your data has to greatly exceed these limits.
Cheers, -Tony <clip_vs_putmask.py>
Example of the problem: #~~~~~~~~~~~~~ import matplotlib.pyplot as plt import numpy as np
cmap = plt.cm.gray cmap.set_over('r', 1.0) cmap.set_under('g', 1.0) cmap.set_bad('b', 1.0)
eps = 1E-8
A = np.arange(100).reshape(10, 10) plt.pcolor(A, vmin=50, vmax=50+eps, cmap=cmap) # the plot should be about half red and half green (plus a black square) # without patch, some of the red squares are filled green plt.show() #~~~~~~~~~~~~~
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