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93 lines
2.6 KiB
C++
Executable File
93 lines
2.6 KiB
C++
Executable File
//static const char* sccsid = "@(#)Expr_ArgCosh.cxx 3.2 95/01/10"; // Do not delete this line. Used by sccs.
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// Copyright: Matra-Datavision 1991
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// File: Expr_ArgCosh.cxx
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// Created: Mon May 27 11:59:06 1991
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// Author: Arnaud BOUZY
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// <adn>
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#include <Expr_ArgCosh.ixx>
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#include <Expr_NumericValue.hxx>
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#include <Expr_Cosh.hxx>
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#include <Expr_Division.hxx>
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#include <Expr_Square.hxx>
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#include <Expr_Difference.hxx>
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#include <Expr_SquareRoot.hxx>
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#include <Expr_Operators.hxx>
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#include <Expr.hxx>
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Expr_ArgCosh::Expr_ArgCosh (const Handle(Expr_GeneralExpression)& exp)
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{
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CreateOperand(exp);
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}
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Handle(Expr_GeneralExpression) Expr_ArgCosh::ShallowSimplified () const
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{
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Handle(Expr_GeneralExpression) op = Operand();
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if (op->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
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Handle(Expr_NumericValue) valop = Handle(Expr_NumericValue)::DownCast(op);
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return new Expr_NumericValue(ACosh(valop->GetValue()));
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}
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if (op->IsKind(STANDARD_TYPE(Expr_Cosh))) {
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return op->SubExpression(1);
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}
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Handle(Expr_ArgCosh) me = this;
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return me;
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}
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Handle(Expr_GeneralExpression) Expr_ArgCosh::Copy () const
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{
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return new Expr_ArgCosh(Expr::CopyShare(Operand()));
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}
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Standard_Boolean Expr_ArgCosh::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
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{
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if (!Other->IsKind(STANDARD_TYPE(Expr_ArgCosh))) {
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return Standard_False;
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}
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Handle(Expr_GeneralExpression) op = Operand();
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return op->IsIdentical(Other->SubExpression(1));
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}
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Standard_Boolean Expr_ArgCosh::IsLinear () const
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{
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if (ContainsUnknowns()) {
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return Standard_False;
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}
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return Standard_True;
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}
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Handle(Expr_GeneralExpression) Expr_ArgCosh::Derivative (const Handle(Expr_NamedUnknown)& X) const
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{
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if (!Contains(X)) {
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return new Expr_NumericValue(0.0);
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}
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Handle(Expr_GeneralExpression) op = Operand();
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Handle(Expr_GeneralExpression) derop = op->Derivative(X);
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Handle(Expr_Square) sq = new Expr_Square(Expr::CopyShare(op));
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// X2 - 1
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Handle(Expr_Difference) thedif = sq->ShallowSimplified() - 1.0;
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// sqrt(X2 - 1)
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Handle(Expr_SquareRoot) theroot = new Expr_SquareRoot(thedif->ShallowSimplified());
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// ArgCosh'(F(X)) = F'(X)/sqrt(F(X)2-1)
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Handle(Expr_Division) thediv = derop / theroot->ShallowSimplified();
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return thediv->ShallowSimplified();
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}
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Standard_Real Expr_ArgCosh::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
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{
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Standard_Real val = Operand()->Evaluate(vars,vals);
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return ::Log(val + ::Sqrt(::Square(val)-1.0));
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}
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TCollection_AsciiString Expr_ArgCosh::String() const
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{
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TCollection_AsciiString str("ACosh(");
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str += Operand()->String();
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str += ")";
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return str;
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}
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