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diff test/diag-perm.tst @ 20603:f61c67865d9f

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Don't return A for inv (A) when A is a singular Diagonal matrix (bug #46103). * dDiagMatrix.cc (inverse), fDiagMatrix.cc (inverse): return octave_Inf for the inverse of a diagonal element whose value is 0. * test/diag-perm.tst: Add tests for new behavior.
author Rik <rik@octave.org>
date Wed, 07 Oct 2015 07:41:44 -0700
parents 4197fc428c7d
children
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--- a/test/diag-perm.tst	Tue Oct 06 22:14:41 2015 +0200
+++ b/test/diag-perm.tst	Wed Oct 07 07:41:44 2015 -0700
@@ -263,3 +263,10 @@
 %! A = A * I () + A;
 %! A(6, 4) = nan ();
 %! assert (full (D - A), D - full (A));
+
+## inverse preserves diagonal structure even for singular matrices (bug #46103)
+%!test
+%! x = diag (1:3);
+%! assert (inv (x), diag ([1 1/2 1/3]));
+%! x = diag (0:2);
+%! assert (inv (x), diag ([Inf 1 1/2]));