[SciPy-Dev] scipy.io.savemat and sparse matrices

[Matthew Brett]

Hi,

On Fri, Apr 8, 2011 at 5:17 AM, Nils Wagner
<nwagner at iam.uni-stuttgart.de> wrote:
> Hi all,
>
> I tried to save a sparse matrix
>
>
>     savemat('mass.mat',dict(M_sparse))
>   File
> "/data/home/nwagner/local/lib/python2.5/site-packages/scipy/sparse/base.py",
> line 109, in __iter__
>     yield self[r,:]
> TypeError: 'coo_matrix' object is unsubscriptable

I think you'll get the same error from:

dict(M_sparse)

that is - you need to give the input dict a key, with the sparse
matrix as a value, as in

savemat('mass.mat', dict(aname=M_sparse))

Best,

Matthew