[Numpy-discussion] finding nonzero elements in list

per freem perfreem@gmail....
Mon Oct 12 09:18:44 CDT 2009


hi all,

i'm trying to find nonzero elements in an array, as follows:

a = array([[1, 0],
       [1, 1],
       [1, 1],
       [0, 1]])

i want to find all elements that are [1,1]. i tried: nonzero(a ==
[1,0]) but i cannot interpret the output. the output i get is:
(array([0, 0, 1, 2]), array([0, 1, 0, 0]))

i simply want to find the indices of the elements that equal [1,0].
how can i do this? thanks.


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