[SciPy-user] nonzero and the matlab equivalent of find

per freem perfreem@gmail....
Sun Jul 12 16:51:04 CDT 2009


hi all,

i am trying to find an equivalent of matlab's find in scipy. the
documentation says to use nonzero but i am not sure how to interpret the
results.

suppose i have an array:

a = [[0, 1], [1, 1], [1, 0]]

and i want to return the indices (0, 1, or 2 in this case) of the elements
that are [1, 1]. the natural notation seems to be:

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

but this returns: (array([0, 1, 1, 2]), array([1, 0, 1, 0])) -- not sure
what this output means.

can someone please explain how to find the elements that are [1,1], like in
matlab's "find"? thank you.
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