Question w.r.t. sparse matrices
Hi, 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() 2
How can I obtain the pattern of x ? I mean the indices of nonzero elements. Nils
Nils Wagner wrote:
Hi,
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() 2
How can I obtain the pattern of x ? I mean the indices of nonzero elements.
Nils
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Sorry for replying to myself. It seems to be not implemented yet.
where (x <>0) Traceback (most recent call last): File "<stdin>", line 1, in ? File "/usr/lib/python2.4/site-packages/scipy/sparse/sparse.py", line 160, in __cmp__ raise TypeError, "comparison of sparse matrices not implemented" TypeError: comparison of sparse matrices not implemented
Nils
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Nils Wagner