On 10/19/12 7:25 AM, Dima Pasechnik wrote:
While some ARPACK functionality is available in Sage from scipy (more is
implemented in scipy 0.11, than in currently available in Sage scipy
0.9, but this is taken care of in #13541, which I'm reviewing presently),
the functionality allowing to implement matrices as callback functions
(sometimes a big win in memory/speed) seems to be missing.
Any idea how can this be handled?
Do you mean a sparse matrix class where A[i,j] actually calls some
function that you supply? I'd make a subclass of sparse matrices (or
maybe even dense matrices??), and just override the unsafe indexing
method. I think all indexing ends up going through that function.
Thanks,
Jason
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