Changeset 2927

Timestamp:

03/04/10 13:17:43 (15 years ago)

Author:

abeham

Message:

fixed a bug in the SimulatedBinaryCrossover #890

File:

• trunk/sources/HeuristicLab.Encodings.RealVector/3.3/Crossovers/SimulatedBinaryCrossover.cs (modified) (3 diffs)

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

@@ -58 +58 @@
     /// </summary>
     /// <exception cref="ArgumentException">Thrown when the parents' vectors are of unequal length or when <paramref name="contiguity"/> is smaller than 0.</exception>
+    /// <remarks>
+    /// The manipulated value is not restricted by the (possibly) specified lower and upper bounds. Use the <see cref="BoundsChecker"/> to correct the values after performing the crossover.
+    /// </remarks>
     /// <param name="random">The random number generator to use.</param>
     /// <param name="parent1">The first parent vector.</param>
@@ -69 +72 @@
       DoubleArrayData result = new DoubleArrayData(length);
       for (int i = 0; i < length; i++) {
-        if (random.NextDouble() < 0.5) { // cross this variable
+        if (length == 1 || random.NextDouble() < 0.5) { // cross this variable
           double u = random.NextDouble();
           double beta = 0;
@@ -83 +86 @@
           else
             result[i] = ((parent1[i] + parent2[i]) / 2.0) + beta * 0.5 * Math.Abs(parent1[i] - parent2[i]);
-        }
+        } else result[i] = parent1[i];
       }
       return result;