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[Octave-bug-tracker] [bug #41426] OOM for issymmetric on sparse matrices

From: David Bateman
Subject: [Octave-bug-tracker] [bug #41426] OOM for issymmetric on sparse matrices
Date: Sun, 02 Feb 2014 16:31:22 +0000
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:26.0) Gecko/20100101 Firefox/26.0

Follow-up Comment #2, bug #41426 (project octave):

retval = any ((x != x.')(:));

seems slightly faster for full matrices and about the same speed as the
original code, but the "(:)" creates an out of memory error for large sparse
matrices as well. The difference in speed for the two versions for full
matrices only seems to be about 5% so maybe we should just take your patch as
is otherwise something like

if (issparse (x))
  retval = nnz (x != x.') == 0;
  retval = all ((x == x.')(:));

might be appropriate 



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