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From s...@apache.org
Subject svn commit: r1060917 - /commons/proper/math/branches/MATH_2_X/src/main/java/org/apache/commons/math/util/FastMath.java
Date Wed, 19 Jan 2011 19:26:19 GMT
Author: sebb
Date: Wed Jan 19 19:26:19 2011
New Revision: 1060917

URL: http://svn.apache.org/viewvc?rev=1060917&view=rev
Log:
MATH-478 FastMath is not an exact replacement for StrictMath
Add signum(float)

Modified:
    commons/proper/math/branches/MATH_2_X/src/main/java/org/apache/commons/math/util/FastMath.java

Modified: commons/proper/math/branches/MATH_2_X/src/main/java/org/apache/commons/math/util/FastMath.java
URL: http://svn.apache.org/viewvc/commons/proper/math/branches/MATH_2_X/src/main/java/org/apache/commons/math/util/FastMath.java?rev=1060917&r1=1060916&r2=1060917&view=diff
==============================================================================
--- commons/proper/math/branches/MATH_2_X/src/main/java/org/apache/commons/math/util/FastMath.java
(original)
+++ commons/proper/math/branches/MATH_2_X/src/main/java/org/apache/commons/math/util/FastMath.java
Wed Jan 19 19:26:19 2011
@@ -582,6 +582,15 @@ public class FastMath {
         return (a < 0.0) ? -1.0 : ((a > 0.0) ? 1.0 : a);
     }
 
+    /** Compute the signum of a number.
+     * The signum is -1 for negative numbers, +1 for positive numbers and 0 otherwise
+     * @param a number on which evaluation is done
+     * @return -1, 0, +1 or NaN depending on sign of a
+     */
+    public static float signum(final float a) {
+        return (a < 0.0f) ? -1.0f : ((a > 0.0f) ? 1.0f : a);
+    }
+
     /** Compute next number towards positive infinity.
      * @param a number to which neighbor should be computed
      * @return neighbor of a towards positive infinity



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