Re: [Pysparse-users] Reshape Matrix

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

On Sat, Oct 24, 2009 at 5:02 PM,  <mv...@uv...> wrote:
> Hi,
>
> I was wondering if there is an easy way to extend or reshape a matrix.
>
> For example...
> If I had a vector of length 10000 (shape=(1,10000)), then wanted to insert
> a new element at position 11000 without creating an entirely new vector to
> store it.
>
> I've looked at the Docs, and messed around with the package but was unable
> to find a simple way to do this.  Any tips would be appreaciated.
>
> Thanks,
> Matt

Hi Matt,

Currently there is no provision for reshaping, clipping or expanding
matrices in PySparse. I can only imagine doing this efficiently on
matrices in linked-list format. There are essentially two ways to
implement it: by adding methods at C level in ll_mat.c, or by
expanding/subclassing the high-level PysparseMatrix class. If you
decide to have a stab at it, I suggest the second avenue first,
although I am not sure at this point that it is doable without getting
your hands dirty in the C code.

Are you in a situation where you don't know your problem size beforehand?

-- 
Dominique