[SciPy-user] Interaction of sparse and dense matrices in scipy
Nils Wagner
nwagner at mecha.uni-stuttgart.de
Mon Feb 20 03:30:12 CST 2006
Hi all,
I need some advice on operations between dense and sparse matrix "objects".
Which operations are possible in scipy ?
Assume that A and B are sparse while C and D are dense matrices of
appropriate dimension.
dense sparse
dot(C,D) A*B
linalg.norm(C) linalg.norm(C.todense())
linalg.kron(C,D) ?
identity(n), eye(n)
How about interactions of sparse and dense matrices
- multiplication of a sparse matrix A with a dense matrix C
- Kronecker product of sparse matrices ?
- Kronecker product of a dense and a sparse matrix ?
- sparse matrix functions expm(A),... ?
- sparse eigensolver
- to be continued
Can I use different sparse formats like csc and csr w.r.t. to
multiplication, addition,...
And what is the output of A = io.mmread("A.mtx") ? I mean sparse or dense.
Any comments ?
Nils
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