[Numpy-discussion] Can't mix np.newaxis with boolean indexing

Benjamin Root ben.root@ou....
Fri Aug 19 10:50:50 CDT 2011


I could have sworn that this use to work:

import numpy as np
a = np.random.random((100,))
b = (a > 0.5)
print a[b, np.newaxis]

But instead, I get this error on the latest master:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: long() argument must be a string or a number, not 'NoneType'

Note, the simple work-around would be "a[b][:, np.newaxis]", but I can't
imagine why the intuitive syntax would not be valid.

Thanks,
Ben Root
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