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trunk/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Converters/DerivativeCalculator.cs
r16905 r17125 179 179 var u = (ISymbolicExpressionTreeNode)branch.GetSubtree(0).Clone(); 180 180 return Div(fxp, Square(Cosine(u))); 181 } 182 if (branch.Symbol is HyperbolicTangent) { 183 // tanh(f(x))' = f(x)'sech²(f(x)) = f(x)'(1  tanh²(f(x))) 184 var fxp = Derive(branch.GetSubtree(0), variableName); 185 var tanh = (ISymbolicExpressionTreeNode)branch.Clone(); 186 return Product(fxp, Subtract(CreateConstant(1.0), Square(tanh))); 181 187 } 182 188 throw new NotSupportedException(string.Format("Symbol {0} is not supported.", branch.Symbol)); 
trunk/HeuristicLab.Tests/HeuristicLab.Problems.DataAnalysis.Symbolic3.4/DeriveTest.cs
r16737 r17125 68 68 69 69 Assert.AreEqual("('a' * 'b' * 'c')", Derive("a*b*c*d", "d")); 70 Assert.AreEqual("('a' / ('b' * 'c' * SQR('d') * (1)))", Derive("a/b/c/d", "d")); 70 Assert.AreEqual("('a' / ('b' * 'c' * SQR('d') * (1)))", Derive("a/b/c/d", "d")); 71 72 Assert.AreEqual("('x' * ((SQR(TANH(SQR('x'))) * (1)) + 1) * 2)", Derive("tanh(sqr(x))", "x")); // (2*'x'*(1  SQR(TANH(SQR('x')))) 71 73 72 74 {
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