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diff NEWS @ 19276:ba7e42dea4b2

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Fix returned phase of asin, acos outside principal branch (bug #43349). * NEWS: Announce change in phase for inputs outside the principal branch [-1,1]. * mappers.cc (Fasin, Facos): Add BIST tests to check values outside principal branch. * lo-mappers.cc (acos (const Complex& x), asin (const Complex& x), acos (const FloatComplex& x),asin (const FloatComplex& x): Update double and float versions of asin, acos to check if input is real (imag == 0). If so, avoid intermediate calculation that produces -0i which affects phase (but not magnitude) of result.
author Rik <rik@octave.org>
date Thu, 09 Oct 2014 16:14:46 -0700
parents 93f7f4d074b1
children a4e993343e93
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line diff
--- a/NEWS	Tue Oct 07 22:37:39 2014 +0530
+++ b/NEWS	Thu Oct 09 16:14:46 2014 -0700
@@ -31,6 +31,13 @@
     triangulation is always returned.  The delaunay3 function which
     handles 3-D inputs has been deprecated in favor of delaunay.
 
+ ** The trigonometric functions asin and acos return different phase values
+    from previous versions of Octave when the input is outside the principal
+    branch ([-1, 1]).  If the real portion of the input is greater than 1 then
+    the limit from below is taken.  If the real portion is less than 1 then the
+    limit from above is taken.  This criteria is consistent with several other
+    numerical analysis software packages.
+
  ** Integer formats used in the printf family of functions now work for
     64-bit integers and are more compatible with Matlab when printing
     non-integer values.  Now instead of truncating, Octave will switch