pysparse-users

[Pysparse-users] sparse binary matrix

[Yoshi R. <y...@ro...>]

hey - nice work!

we use your software in an open source project (not published yet)
for complex networks and our sparse matrices are adjacency matrices.
often we use unweighted networks so the matrix consists of ones and
zeros, so there is no need for a double precision array ...

so until now i used a single integer array for storing such a matrix,
that is also easy to pass to a c function from python. is there a way
to do such a thing in your framework? passing sparse matrices to a
python module in c and save memory by not allocating a double array?

thank you - best regards

Re: [Pysparse-users] sparse binary matrix

[Dominique O. <dom...@gm...>]

On Thu, Apr 28, 2011 at 8:40 AM, Yoshi Rokuko <y...@ro...> wrote:

> hey - nice work!
>
> we use your software in an open source project (not published yet)
> for complex networks and our sparse matrices are adjacency matrices.
> often we use unweighted networks so the matrix consists of ones and
> zeros, so there is no need for a double precision array ...
>
> so until now i used a single integer array for storing such a matrix,
> that is also easy to pass to a c function from python. is there a way
> to do such a thing in your framework? passing sparse matrices to a
> python module in c and save memory by not allocating a double array?
>

Hi Yoshi,

Thanks for the compliments!

At this point, there is no way to just store a sparsity pattern in PySparse
but that would be easy enough to add. However the bigger question is: what
do you need to do with your matrix? Just multiplies to determine paths or do
you need a factorization of some sort?

Cheers,

-- 
Dominique