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[Octave-bug-tracker] [bug #41453] norm is really slow for sparse matrice

From: Carlo de Falco
Subject: [Octave-bug-tracker] [bug #41453] norm is really slow for sparse matrices
Date: Sun, 30 Mar 2014 18:12:59 +0000
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:28.0) Gecko/20100101 Firefox/28.0

Follow-up Comment #6, bug #41453 (project octave):

no it is not clean.

having to use a different 
function to compute the norm of a sparse matrix
is not compatible and is no improvement at all
with having to call

svds (A, 1);

yes you can call an m-file function from c++
but that is not a clean solution either.

did you try to look at what svds does internally?
it will somehow rely on arpack in the end, and arpack
is a fortran library, not m-code.

do you think you would be able to implement this
using calls to arpack instead of svds.m?


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