[Numpy-discussion] bug with assignment into an indexed array?
Benjamin Root
ben.root@ou....
Wed Aug 10 15:55:37 CDT 2011
Came across this today when trying to determine what was wrong with my code:
import numpy as np
matched_to = np.array([-1] * 5)
in_ellipse = np.array([False, True, True, True, False])
match = np.array([False, True, True])
matched_to[in_ellipse][match] = 3
I would expect matched_to to now be "array([-1, -1, 3, 3, -1])", but
instead, it is still all -1.
It would seem that unless the view was created by a slice, then the
assignment into the indexed view would not work as expected. This works:
>>> matched_to[:3][match] = 3
but not:
>>> matched_to[np.array([0, 1, 2])][match] = 3
Note that the following does work:
>>> matched_to[np.array([0, 1, 2])] = 3
Is this a bug, or was I wrong to expect this to work this way?
Thanks,
Ben Root
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