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Fix return phase of acosh to match Matlab (bug #44286). * NEWS: Announce change. * mappers.cc (Facosh): Add BIST tests for new behavior. * lo-mappers.cc: Re-write expression sqrt (x*x -1.0) as sqrt (x + 1.0) * sqrt (x - 1.0) which gets phase correct if x is complex.
author Rik <rik@octave.org>
date Tue, 17 Feb 2015 11:07:01 -0800
parents 59ad278cfb98
children b8e4104a8f55
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--- a/NEWS
+++ b/NEWS
@@ -87,6 +87,10 @@
     limit from above is taken.  This criteria is consistent with several other
     numerical analysis software packages.
 
+ ** The hyperbolic function acosh now returns values with a phase in the range
+    [-pi/2, +pi/2].  Previously Octave returned values in the range [0, pi].
+    This is consistent with several other numerical analysis software packages.
+
  ** strfind changes when using empty pattern ("") for Matlab compatibility
 
     strfind now returns an empty array when the pattern itself is empty.