| Re: [eigen] [PATCH] Toeplitz matrix specialization |
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On Thu, 29 Jan 2009, Gael Guennebaud wrote:
to start the debate I put some thougths on the wiki:
http://eigen.tuxfamily.org/index.php?title=SpecialMatrix
Does "we assume we don't need a special class for triangular storage" mean
that triangular matrices are stored as general matrices (and thus half the
memory is wasted)? That strikes me as an assumption that could be
regretted later. So perhaps we should make sure that a special class for
triangular storage can be added later.
One other usage scenario, of which I'm wondering how difficult it would be
to implement in the current setting, is in-place LU decomposition (that
is, replace the matrix A by its L and U factors, so that you don't need to
allocate extra memory except for the permutation vector).
Cheers,
Jitse