Mercurial > hg > camir-ismir2012

diff toolboxes/FullBNT-1.0.7/KPMtools/is_psd.m @ 0:cc4b1211e677 tip

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initial commit to HG from Changeset: 646 (e263d8a21543) added further path and more save "camirversion.m"
author Daniel Wolff
date Fri, 19 Aug 2016 13:07:06 +0200
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolboxes/FullBNT-1.0.7/KPMtools/is_psd.m	Fri Aug 19 13:07:06 2016 +0200
@@ -0,0 +1,11 @@
+function b = positive_semidefinite(M)
+%
+% Return true iff v M v' >= 0 for any vector v.
+% We do this by checking that all the eigenvalues are non-negative.
+
+E = eig(M);
+if length(find(E>=0)) == length(E)
+  b = 1;
+else
+  b = 0;
+end