Changeset 16905 for trunk/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Converters/DerivativeCalculator.cs

Timestamp:

05/07/19 14:20:33 (5 years ago)

Author:

gkronber

Message:

#2915: Corrected calculation of cuberoot function in all interpreters and updated all formatters.
I tested a run with all interpreters and got the same results with all of them.

File:

• trunk/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Converters/DerivativeCalculator.cs (modified) (1 diff)

trunk/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Converters/DerivativeCalculator.cs

@@ -143 +143 @@
         var f = (ISymbolicExpressionTreeNode)branch.Clone();
         var u = (ISymbolicExpressionTreeNode)branch.GetSubtree(0).Clone();
-        return Product(Div(CreateConstant(1.0), Product(CreateConstant(3.0), Square(f))), Derive(u, variableName));
+        return Product(Div(CreateConstant(1.0), Product(CreateConstant(3.0), Square(f))), Derive(u, variableName));  // 1/3 1/cbrt(f(x))^2 d/dx f(x)
       }
       if (branch.Symbol is Cube) {