svn commit: r710172 - /commons/proper/math/branches/MATH_2_0/src/java/org/apache/commons/math/util/MathUtils.java

[lu...@apache.org]

Author: luc
Date: Mon Nov  3 13:37:51 2008
New Revision: 710172

URL: http://svn.apache.org/viewvc?rev=710172&view=rev
Log:
added IEEE-754 related useful constants

Modified:
    commons/proper/math/branches/MATH_2_0/src/java/org/apache/commons/math/util/MathUtils.java

Modified: commons/proper/math/branches/MATH_2_0/src/java/org/apache/commons/math/util/MathUtils.java
URL: http://svn.apache.org/viewvc/commons/proper/math/branches/MATH_2_0/src/java/org/apache/commons/math/util/MathUtils.java?rev=710172&r1=710171&r2=710172&view=diff
==============================================================================
--- commons/proper/math/branches/MATH_2_0/src/java/org/apache/commons/math/util/MathUtils.java (original)
+++ commons/proper/math/branches/MATH_2_0/src/java/org/apache/commons/math/util/MathUtils.java Mon Nov  3 13:37:51 2008
@@ -25,6 +25,15 @@
  */
 public final class MathUtils {
 
+    /** Smallest positive number such that 1 - EPSILON is not numerically equal to 1. */
+    public static final double EPSILON = 0x1.0p-53;
+
+    /** Safe minimum, such that 1 / SAFE_MIN does not overflow.
+     * <p>In IEEE 754 arithmetic, this is also the smallest normalized
+     * number 2<sup>-1022</sup>.</p>
+     */
+    public static final double SAFE_MIN = 0x1.0p-1022;
+
     /** -1.0 cast as a byte. */
     private static final byte  NB = (byte)-1;