Changeset 5739 for trunk/sources/HeuristicLab.Common/3.3/DoubleExtensions.cs

Timestamp:

03/17/11 16:30:37 (13 years ago)

Author:

gkronber

Message:

#1443 minor change to reduce expected number of comparisons in double.IsAlmost extension

File:

• trunk/sources/HeuristicLab.Common/3.3/DoubleExtensions.cs (modified) (1 diff)

trunk/sources/HeuristicLab.Common/3.3/DoubleExtensions.cs

@@ -24 +24 @@
   public static class DoubleExtensions {
     public static bool IsAlmost(this double x, double y) {
-      if (double.IsPositiveInfinity(x)) return double.IsPositiveInfinity(y);
-      if (double.IsNegativeInfinity(x)) return double.IsNegativeInfinity(y);
-
-      return Math.Abs(x - y) < 1.0E-12;
+      if (double.IsInfinity(x)) {
+        if (x > 0) return double.IsPositiveInfinity(y);
+        else return double.IsNegativeInfinity(y);
+      } else {
+        return Math.Abs(x - y) < 1.0E-12;
+      }
     }
   }