1 // Created on: 1991-05-27
2 // Created by: Arnaud BOUZY
3 // Copyright (c) 1991-1999 Matra Datavision
4 // Copyright (c) 1999-2014 OPEN CASCADE SAS
6 // This file is part of Open CASCADE Technology software library.
8 // This library is free software; you can redistribute it and/or modify it under
9 // the terms of the GNU Lesser General Public License version 2.1 as published
10 // by the Free Software Foundation, with special exception defined in the file
11 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
12 // distribution for complete text of the license and disclaimer of any warranty.
14 // Alternatively, this file may be used under the terms of Open CASCADE
15 // commercial license or contractual agreement.
19 #include <Expr_ArgTanh.hxx>
20 #include <Expr_Difference.hxx>
21 #include <Expr_Division.hxx>
22 #include <Expr_GeneralExpression.hxx>
23 #include <Expr_NamedUnknown.hxx>
24 #include <Expr_NotEvaluable.hxx>
25 #include <Expr_NumericValue.hxx>
26 #include <Expr_Operators.hxx>
27 #include <Expr_Square.hxx>
28 #include <Expr_Tanh.hxx>
29 #include <Standard_NumericError.hxx>
30 #include <Standard_Type.hxx>
31 #include <TCollection_AsciiString.hxx>
33 IMPLEMENT_STANDARD_RTTIEXT(Expr_ArgTanh,Expr_UnaryExpression)
35 Expr_ArgTanh::Expr_ArgTanh (const Handle(Expr_GeneralExpression)& exp)
40 Handle(Expr_GeneralExpression) Expr_ArgTanh::ShallowSimplified () const
42 Handle(Expr_GeneralExpression) op = Operand();
43 if (op->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
44 Handle(Expr_NumericValue) valop = Handle(Expr_NumericValue)::DownCast(op);
45 return new Expr_NumericValue(ATanh(valop->GetValue()));
47 if (op->IsKind(STANDARD_TYPE(Expr_Tanh))) {
48 return op->SubExpression(1);
50 Handle(Expr_ArgTanh) me = this;
54 Handle(Expr_GeneralExpression) Expr_ArgTanh::Copy () const
56 return new Expr_ArgTanh(Expr::CopyShare(Operand()));
59 Standard_Boolean Expr_ArgTanh::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
61 if (!Other->IsKind(STANDARD_TYPE(Expr_ArgTanh))) {
62 return Standard_False;
64 Handle(Expr_GeneralExpression) op = Operand();
65 return op->IsIdentical(Other->SubExpression(1));
68 Standard_Boolean Expr_ArgTanh::IsLinear () const
70 if (ContainsUnknowns()) {
71 return Standard_False;
76 Handle(Expr_GeneralExpression) Expr_ArgTanh::Derivative (const Handle(Expr_NamedUnknown)& X) const
79 return new Expr_NumericValue(0.0);
81 Handle(Expr_GeneralExpression) op = Operand();
82 Handle(Expr_GeneralExpression) derop = op->Derivative(X);
84 Handle(Expr_Square) sq = new Expr_Square(Expr::CopyShare(op));
88 Handle(Expr_Difference) thedif = 1.0 - sq->ShallowSimplified();
90 // ArgTanh'(F(X)) = F'(X)/(1 - F(X)2)
91 Handle(Expr_Division) thediv = derop / thedif->ShallowSimplified();
93 return thediv->ShallowSimplified();
96 Standard_Real Expr_ArgTanh::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
98 Standard_Real val = Operand()->Evaluate(vars,vals);
99 return ::Log((1.0+val)/(1.0-val))/2.0;
102 TCollection_AsciiString Expr_ArgTanh::String() const
104 TCollection_AsciiString str("ATanh(");
105 str += Operand()->String();