Changeset 3535 for trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.3/Manipulators

Timestamp:

04/26/10 16:16:49 (14 years ago)

Author:

gkronber

Message:

Fixed bugs in manipulation operators. #937 (Data types and operators for symbolic expression tree encoding)

File:

• trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.3/Manipulators/OnePointShaker.cs (modified) (1 diff)

trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.3/Manipulators/OnePointShaker.cs

@@ -37 +37 @@
 
     protected override void Manipulate(IRandom random, SymbolicExpressionTree symbolicExpressionTree, ISymbolicExpressionGrammar grammar, IntValue maxTreeSize, IntValue maxTreeHeight, out bool success) {
+      var parametricNodes = from node in symbolicExpressionTree.IterateNodesPrefix()
+                            where node.HasLocalParameters
+                            select node;
+      if (parametricNodes.Count() > 0) {
+        SymbolicExpressionTreeNode selectedPoint = parametricNodes.SelectRandom(random);
 
-      SymbolicExpressionTreeNode selectedPoint = (from node in symbolicExpressionTree.IterateNodesPrefix()
-                                                  where node.HasLocalParameters
-                                                  select node).SelectRandom(random);
-
-      selectedPoint.ShakeLocalParameters(random, 1.0);
-      success = true;
+        selectedPoint.ShakeLocalParameters(random, 1.0);
+        success = true;
+      } else {
+        success = false;
+      }
     }
   }