[SciPy-user] Cannot handle sparse matrices, yet.

[Nils Wagner]

Arnd Baecker schrieb:
> 
> Hi Nils,
> 
> though not feeling as an expert on this, may I still
> ask if you are 100% sure that k0 is really stored as a full matrix?
> Somehow it seems that the stored k0 still "knows" that it
> came from a sparse matrix.
> Does save -mat -v4 k0 lead to a resonably larger
> file than save -mat -v4 k00 ?

Yes.

> Is the shape of k0 the right one?

Yes

> What happens if you assign a new matrix k1=IdentityMatrix * k0
> and store that ?

Nothing changes.
> 
> Presumably you this kind of tests already ...
> 
> Arnd

The matrix is complex. Is this a problem for loadmat ?

Nils


> 
> On Wed, 15 Oct 2003, Nils Wagner wrote:
> 
> > Dear experts,
> >
> > At the beginning I have used
> >
> > k0=full(k00)
> >
> > to convert the sparse matrix k00 to a full matrix k0.
> > Then I have used the -v4 option in Matlab to save the full matrix
> >
> > save -mat -v4 k0
> >
> > However, I cannot import the f u l l matrix k0 in scioy
> >
> > Traceback (most recent call last):
> >   File "matlab.py", line 4, in ?
> >     io.loadmat("k0",appendmat=0)
> >   File "/usr/local/lib/python2.1/site-packages/scipy/io/mio.py", line
> > 423, in loadmat
> >     raise ValueError, "Cannot handle sparse matrices, yet."
> > ValueError: Cannot handle sparse matrices, yet.
> >
> > For what reason ?
> >
> > Nils
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> >
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