From maintainers-request at octave dot org Wed Dec 1 04:09:02 2004 Subject: Re: full/sparse/banded/triangular matrices... From: David Bateman To: Paul Kienzle Cc: octave maintainers mailing list Date: Wed, 1 Dec 2004 11:05:11 +0100 According to Paul Kienzle (on 12/01/04): > LAPACK also has tridiagonal functions. In the spline code we are > doing a couple of rotations outside the solver so that the cyclic > case doesn't need a full matrix solve. I doubt you want to support > a mostly banded matrix class though. Isn't tridiagonal just a special case of a banded matrix? Does it need special treatment relative to a banded matrix? Your cyclic solver would though, humm... > Another matrix attribute to consider is a transpose marker, but like > triangular matrices, this only gives a small speedup compared to the > cost of the op. Yeah, I think I place that one in the nice but not worth it basket... D. -- David Bateman David dot Bateman at motorola dot com Motorola CRM +33 1 69 35 48 04 (Ph) Parc Les Algorithmes, Commune de St Aubin +33 1 69 35 77 01 (Fax) 91193 Gif-Sur-Yvette FRANCE The information contained in this communication has been classified as: [x] General Business Information [ ] Motorola Internal Use Only [ ] Motorola Confidential Proprietary