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annotate toolboxes/FullBNT-1.0.7/KPMtools/isposdef.m @ 0:e9a9cd732c1e tip

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first hg version after svn
author wolffd
date Tue, 10 Feb 2015 15:05:51 +0000
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wolffd@0 1 function b = isposdef(a)
wolffd@0 2 % ISPOSDEF Test for positive definite matrix.
wolffd@0 3 % ISPOSDEF(A) returns 1 if A is positive definite, 0 otherwise.
wolffd@0 4 % Using chol is much more efficient than computing eigenvectors.
wolffd@0 5
wolffd@0 6 % From Tom Minka's lightspeed toolbox
wolffd@0 7
wolffd@0 8 [R,p] = chol(a);
wolffd@0 9 b = (p == 0);