Changeset 6755

Timestamp:

09/13/11 17:38:29 (13 years ago)

Author:

gkronber

Message:

#1480 implemented code to handle root symbols for the il emitting interpreter and fixed code for power symbol.

Location:

trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4

Files:

• SymbolicDataAnalysisExpressionTreeILEmittingInterpreter.cs (modified) (2 diffs)
• Tests/SymbolicDataAnalysisExpressionTreeInterpreterTest.cs (modified) (1 diff)

trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/SymbolicDataAnalysisExpressionTreeILEmittingInterpreter.cs

@@ -44 +44 @@
     private static MethodInfo log = typeof(Math).GetMethod("Log", new Type[] { typeof(double) });
     private static MethodInfo power = typeof(Math).GetMethod("Pow", new Type[] { typeof(double), typeof(double) });
+    private static MethodInfo round = typeof(Math).GetMethod("Round", new Type[] { typeof(double) });
 
     internal delegate double CompiledFunction(int sampleIndex, IList<double>[] columns);
@@ -340 +341 @@
             CompileInstructions(il, state);
             CompileInstructions(il, state);
+            il.Emit(System.Reflection.Emit.OpCodes.Call, round);
             il.Emit(System.Reflection.Emit.OpCodes.Call, power);
             return;
           }
         case OpCodes.Root: {
-            throw new NotImplementedException();
+            CompileInstructions(il, state);
+            il.Emit(System.Reflection.Emit.OpCodes.Ldc_R8, 1.0); // 1 / round(...)
+            CompileInstructions(il, state);
+            il.Emit(System.Reflection.Emit.OpCodes.Call, round);
+            il.Emit(System.Reflection.Emit.OpCodes.Div);
+            il.Emit(System.Reflection.Emit.OpCodes.Call, power);
+            return;
           }
         case OpCodes.Exp: {

trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Tests/SymbolicDataAnalysisExpressionTreeInterpreterTest.cs

@@ -276 +276 @@
       Evaluate(interpreter, ds, "(log -3.0)", 0, Math.Log(-3));
 
+      // power
+      Evaluate(interpreter, ds, "(pow 2.0 3.0)", 0, 8.0);
+      Evaluate(interpreter, ds, "(pow 4.0 0.5)", 0, 1.0); // interpreter should round to the nearest integer value value (.5 is rounded to the even number)
+      Evaluate(interpreter, ds, "(pow 4.0 2.5)", 0, 16.0); // interpreter should round to the nearest integer value value (.5 is rounded to the even number)
+      Evaluate(interpreter, ds, "(pow -2.0 3.0)", 0, -8.0);
+      Evaluate(interpreter, ds, "(pow 2.0 -3.0)", 0, 1.0 / 8.0);
+      Evaluate(interpreter, ds, "(pow -2.0 -3.0)", 0, -1.0 / 8.0);
+
+      // root
+      Evaluate(interpreter, ds, "(root 9.0 2.0)", 0, 3.0);
+      Evaluate(interpreter, ds, "(root 27.0 3.0)", 0, 3.0);
+      Evaluate(interpreter, ds, "(root 2.0 -3.0)", 0, Math.Pow(2.0, -1.0 / 3.0));
+
       // mean
       Evaluate(interpreter, ds, "(mean -1.0 1.0 -1.0)", 0, -1.0 / 3.0);