[pure-lang-svn] SF.net SVN: pure-lang:[535] pure/trunk/lib/math.pure

[<ag...@us...>]

Revision: 535
          http://pure-lang.svn.sourceforge.net/pure-lang/?rev=535&view=rev
Author:   agraef
Date:     2008-08-18 23:38:38 +0000 (Mon, 18 Aug 2008)

Log Message:
-----------
Better complex sqrt definition, suggested by Eddie Rucker.

Modified Paths:
--------------
    pure/trunk/lib/math.pure

Modified: pure/trunk/lib/math.pure
===================================================================
--- pure/trunk/lib/math.pure	2008-08-18 23:01:53 UTC (rev 534)
+++ pure/trunk/lib/math.pure	2008-08-18 23:38:38 UTC (rev 535)
@@ -185,8 +185,8 @@
 
 /* Complex sqrt. */
 
-sqrt (x+:y)	= sqrt r * (cos t +: sin t)
-		  when r = sqrt (x*x+y*y); t = atan2 y x/2 end;
+sqrt (x+:y)	= sqrt ((r+x)/2) +: sqrt ((r-x)/2)
+		  when r = sqrt (x*x+y*y) end;
 sqrt (r<:t)	= sqrt r <: t/2;
 
 // Complex square roots of negative reals.


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