Changeset 1062 for branches/CEDMA-Refactoring-Ticket419/HeuristicLab.Selection

Timestamp:

12/25/08 13:11:27 (16 years ago)

Author:

gkronber

Message:

fixed #444 (TournamentSelector throws NullPointerException when all solutions of a group have quality of positive or negative infinity).

File:

• branches/CEDMA-Refactoring-Ticket419/HeuristicLab.Selection/TournamentSelector.cs (modified) (1 diff)

branches/CEDMA-Refactoring-Ticket419/HeuristicLab.Selection/TournamentSelector.cs

@@ -67 +67 @@
         if (source.SubScopes.Count < 1) throw new InvalidOperationException("No source scopes available to select.");
 
-        double best = maximization ? double.MinValue : double.MaxValue;
-        IScope selectedScope = null;
-        for (int j = 0; j < groupSize; j++) {
+        IScope selectedScope = source.SubScopes[random.Next(source.SubScopes.Count)];
+        double best = selectedScope.GetVariableValue<DoubleData>(qualityInfo.FormalName, false).Data;
+        for (int j = 1; j < groupSize; j++) {
           IScope scope = source.SubScopes[random.Next(source.SubScopes.Count)];
           double quality = scope.GetVariableValue<DoubleData>(qualityInfo.FormalName, false).Data;