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diff NEWS @ 26234:c36b6e371f5d

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isdefinite.m: Return only true or false, not -1, 0, +1 (bug #51270). * NEWS: Announce change * isdefinite.m: Rewrite documentation. Add input validation for TOL. Remove code to check for semi-definite matrix (return value of 0 previously). Update BIST tests and add new ones.
author Rik <rik@octave.org>
date Thu, 13 Dec 2018 17:04:01 -0800
parents f125a6ed45be
children 58b3107a00bc
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--- a/NEWS	Thu Dec 13 15:01:29 2018 -0800
+++ b/NEWS	Thu Dec 13 17:04:01 2018 -0800
@@ -12,6 +12,13 @@
     or "skew" to calculate the symmetric or skew-symmetric property
     of a matrix.  Performance has also been increased.
 
+ ** The function isdefinite now returns true or false rather than
+    -1, 0, 1.  To test for a positive semi-definite matrix (old output
+    of 0) check whether the following two conditions hold:
+
+      isdefinite (A) => 0
+      isdefinite (A + 5*TOL, TOL) => 1
+
  ** The issorted function now uses a direction option of "ascend" or
     "descend" to make it compatible with both the sort function and
     with Matlab.  Change all uses of "ascending" and "descending" in