array + where return type: scalar vs. array
Michael McNeil Forbes
mforbes at phys.washington.edu
Wed Oct 25 01:25:02 EDT 2006
Could someone please explain the semantics of the following.
>>> from numpy import *
>>> a1 = array([1,2,3])
>>> a2 = array([[1,2,3]])
>>> a1[where(a1==3)],a2[where(a2==3)]
(array([3]), 3)
Why are 1-dimensional fundamentally different than N-dimensional arrays
in this regard? When there is a single match, N-d arrays always return
a scalar whereas 1-d arrays return an array.
Is this a bug?
Thanks,
Michael.
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