Changeset 2919

Timestamp:

03/03/10 14:44:49 (15 years ago)

Author:

abeham

Message:

fixed a possible bug in SBX #890

File:

• trunk/sources/HeuristicLab.Encodings.RealVector/3.3/Crossovers/SimulatedBinaryCrossover.cs (modified) (1 diff)

trunk/sources/HeuristicLab.Encodings.RealVector/3.3/Crossovers/SimulatedBinaryCrossover.cs

@@ -70 +70 @@
           if (u < 0.5) { // if u is smaller than 0.5 perform a contracting crossover
             beta = Math.Pow(2 * u, 1.0 / (contiguity.Value + 1));
-          } else { // otherwise perform an expanding crossover
+          } else if (u > 0.5) { // otherwise perform an expanding crossover
             beta = Math.Pow(1.0 / (2 - 2 * u), (contiguity.Value + 1));
-          }
+          } else if (u == 0.5)
+            beta = 1;
+
           if (random.NextDouble() < 0.5)
             result[i] = ((parent1[i] + parent2[i]) / 2.0) - beta * 0.5 * Math.Abs(parent1[i] - parent2[i]);