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_ArgCosh.hxx>
20 #include <Expr_Cosh.hxx>
21 #include <Expr_Difference.hxx>
22 #include <Expr_Division.hxx>
23 #include <Expr_GeneralExpression.hxx>
24 #include <Expr_NamedUnknown.hxx>
25 #include <Expr_NotEvaluable.hxx>
26 #include <Expr_NumericValue.hxx>
27 #include <Expr_Operators.hxx>
28 #include <Expr_Square.hxx>
29 #include <Expr_SquareRoot.hxx>
30 #include <Standard_NumericError.hxx>
31 #include <Standard_Type.hxx>
32 #include <TCollection_AsciiString.hxx>
34 IMPLEMENT_STANDARD_RTTIEXT(Expr_ArgCosh,Expr_UnaryExpression)
36 Expr_ArgCosh::Expr_ArgCosh (const Handle(Expr_GeneralExpression)& exp)
41 Handle(Expr_GeneralExpression) Expr_ArgCosh::ShallowSimplified () const
43 Handle(Expr_GeneralExpression) op = Operand();
44 if (op->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
45 Handle(Expr_NumericValue) valop = Handle(Expr_NumericValue)::DownCast(op);
46 return new Expr_NumericValue(ACosh(valop->GetValue()));
48 if (op->IsKind(STANDARD_TYPE(Expr_Cosh))) {
49 return op->SubExpression(1);
51 Handle(Expr_ArgCosh) me = this;
55 Handle(Expr_GeneralExpression) Expr_ArgCosh::Copy () const
57 return new Expr_ArgCosh(Expr::CopyShare(Operand()));
60 Standard_Boolean Expr_ArgCosh::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
62 if (!Other->IsKind(STANDARD_TYPE(Expr_ArgCosh))) {
63 return Standard_False;
65 Handle(Expr_GeneralExpression) op = Operand();
66 return op->IsIdentical(Other->SubExpression(1));
69 Standard_Boolean Expr_ArgCosh::IsLinear () const
71 if (ContainsUnknowns()) {
72 return Standard_False;
77 Handle(Expr_GeneralExpression) Expr_ArgCosh::Derivative (const Handle(Expr_NamedUnknown)& X) const
80 return new Expr_NumericValue(0.0);
82 Handle(Expr_GeneralExpression) op = Operand();
83 Handle(Expr_GeneralExpression) derop = op->Derivative(X);
85 Handle(Expr_Square) sq = new Expr_Square(Expr::CopyShare(op));
87 Handle(Expr_Difference) thedif = sq->ShallowSimplified() - 1.0;
90 Handle(Expr_SquareRoot) theroot = new Expr_SquareRoot(thedif->ShallowSimplified());
92 // ArgCosh'(F(X)) = F'(X)/sqrt(F(X)2-1)
93 Handle(Expr_Division) thediv = derop / theroot->ShallowSimplified();
95 return thediv->ShallowSimplified();
98 Standard_Real Expr_ArgCosh::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
100 Standard_Real val = Operand()->Evaluate(vars,vals);
101 return ::Log(val + ::Sqrt(::Square(val)-1.0));
104 TCollection_AsciiString Expr_ArgCosh::String() const
106 TCollection_AsciiString str("ACosh(");
107 str += Operand()->String();