[SciPy-user] Interaction of sparse and dense matrices in scipy
Nils Wagner
nwagner at mecha.uni-stuttgart.de
Mon Feb 20 09:30:38 EST 2006
Nils Wagner wrote:
>Robert Cimrman wrote:
>
>>Nils Wagner wrote:
>>
>>
>>
>>>dense sparse
>>>
>>>dot(C,D) A*B
>>>linalg.norm(C) linalg.norm(C.todense())
>>>linalg.kron(C,D) ?
>>>identity(n), eye(n)
>>>
>>>
>>Hi Nils,
>>I have just added speye, spidentity to the scipy.sparse (using spdiags).
>>You can test them in svn.
>>
>>r.
>>
>>
>>
>Hi Robert,
>
>Great ! Thank you very much ! :-)
>
>Nils
>
>
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Hi Robert,
Is there a special reason why you have used the CSC format ?
speye(n, m=None, k=0, dtype='d')
speye( n, m ) returns a (n, m) matrix tored
in CSC sparse matrix format, where the k-th diagonal is all ones,
and everything else is zeros.
It should be stored instead of tored ;-)
spidentity(n, dtype='d')
spidentity( n ) returns the identity matrix of shape (n, n) stored
in CSC sparse matrix format.
Thank you again.
Nils
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