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
