[SciPy-user] sparse matrices -- slicing and fancy indexing for assignment

Stéfan van der Walt stefan@sun.ac...
Wed Oct 1 05:06:48 CDT 2008


2008/9/30 Nathan Bell <wnbell@gmail.com>:
> This is probably all you'll see in 0.7.0
>
> Note that assigning to a CSR/CSC matrix is in general a bad idea.  Any
> change to the sparsity structure of these formats requires O(nnz)
> operations, which basically means reconstructing the matrix from
> scratch.
>
> OTOH MATLAB lets you do it, so we will probably support it someday
> too.  If you submit a patch soon we might be able to integrate it by
> 0.7.0.

I was about to document this, but Nathan has already done the job:

http://projects.scipy.org/scipy/scipy/browser/trunk/scipy/sparse/info.py

Regards
Stéfan


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