[Numpy-discussion] odd behavior for numpy.ndarray index?
Orest Kozyar
orest.kozyar@gmail....
Sun Sep 9 21:36:11 CDT 2007
In the following output (see below), why would x[1,None] work, but
x[1,None,2] or even x[1,2,None] not work?
Incidentally, I would be very interested in a solution that allows me to
index numpy arrays using a list/iterable that might contain None values. Is
there a straightforward way to do so, or should I just use list
comprehensions (i.e. [x[a] for a in indices if a])?
Thanks!
Orest
In [122]: x = arange(5)
In [123]: x[1]
Out[123]: 1
In [124]: x[None]
Out[124]: array([[0, 1, 2, 3, 4]])
In [125]: x[1,None]
Out[125]: array([1])
In [126]: x[1,None,2]
---------------------------------------------------------------------------
<type 'exceptions.IndexError'> Traceback (most recent call last)
c:\documents\research\programs\python\epl\src\<ipython console> in
<module>()
<type 'exceptions.IndexError'>: invalid inde
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