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norm of sparse matrices


From: Marco Caliari
Subject: norm of sparse matrices
Date: Fri, 25 Nov 2011 11:00:40 +0100 (CET)
User-agent: Alpine 1.00 (DEB 882 2007-12-20)

Dear users,

anybody knows which algorithm is used to compute the Euclidean norm of a sparse matrix? An iterative method with a random initial value (such as in normest)? Because I sometimes see different results on the same matrix:

octave:39> S=sprand(5,5,0.5);
octave:40> norm(S)
ans =  1.08208354239579e+00
octave:41> norm(S)
ans =  1.08208354232114e+00
octave:42> norm(S)
ans =  1.08208354232114e+00

(not easy to reproduce this behaviour). I'm using 3.4.1.

Cheers,

Marco


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