[SciPy-dev] Matrix Structure Plots in scipy ?

Pearu Peterson pearu at scipy.org
Wed Oct 6 07:50:13 CDT 2004



On Wed, 6 Oct 2004, Nils Wagner wrote:

> Is it also possible, that mmread returns sparse matrices when reading
> sparse matrices from *.mtx ?

Now yes, mmread will return coo_matrix instance when reading coordinate
.mtx files.

> Is it generally possible to switch between sparse and dense format of 
> matrices in scipy ?

Yes.
>From sparse to dense: <spmatrix instance>.todense()
>From dense to sparse: <spmatrix class>(<array>)

For more info, see scipy.sparse.Sparse.

> Now, scipy has some iterative solvers for linear systems. Can I use both
> dense and sparse matrices with respect to cg,... ?
>
> How about sparse eigensolvers in scipy e.g. ARPACK ?

Cannot answer these questions right now...

Pearu




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