scipy.sparse.

find

scipy.sparse.find(A)

Return the indices and values of the nonzero elements of a matrix

Parameters:

Adense or sparse array or matrix

Matrix whose nonzero elements are desired.

Returns:

(I,J,V)tuple of arrays

I,J, and V contain the row indices, column indices, and values of the nonzero entries.

Examples

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>>> from scipy.sparse import csr_array, find
>>> A = csr_array([[7.0, 8.0, 0],[0, 0, 9.0]])
>>> find(A)
(array([0, 0, 1], dtype=int32),
 array([0, 1, 2], dtype=int32),
 array([ 7.,  8.,  9.]))

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