[SciPy-user] Question w.r.t. sparse matrices

Nils Wagner nwagner at mecha.uni-stuttgart.de
Mon Mar 6 08:38:18 CST 2006


Consider the sparse vector
 >>> x
<420x1 sparse matrix of type '<type 'float64scalar'>'
        with 2 stored elements (space for 2)
        in Compressed Sparse Row format>
 >>> print x
  (3, 0)        1.0
  (30, 0)       1.0

x.getnnz() yields the number of nonzero elements
 >>> x.getnnz()

How can I obtain the pattern of x ?
I mean the indices of nonzero elements.


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