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76 lines
2.2 KiB
C++
Executable File
76 lines
2.2 KiB
C++
Executable File
//static const char* sccsid = "@(#)Expr_LogOf10.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_LogOf10.cxx
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// Created: Mon May 27 17:48:44 1991
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// Author: Arnaud BOUZY
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// <adn>
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#include <Expr_LogOf10.ixx>
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#include <Expr_NumericValue.hxx>
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#include <Expr_Division.hxx>
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#include <Expr_Product.hxx>
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#include <Expr_Operators.hxx>
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#include <Expr.hxx>
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Expr_LogOf10::Expr_LogOf10(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_LogOf10::ShallowSimplified () const
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{
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Handle(Expr_GeneralExpression) myexp = Operand();
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if (myexp->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
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Handle(Expr_NumericValue) myNVexp = Handle(Expr_NumericValue)::DownCast(myexp);
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return new Expr_NumericValue(Log10(myNVexp->GetValue()));
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}
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Handle(Expr_LogOf10) me = this;
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return me;
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}
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Handle(Expr_GeneralExpression) Expr_LogOf10::Copy () const
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{
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return new Expr_LogOf10(Expr::CopyShare(Operand()));
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}
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Standard_Boolean Expr_LogOf10::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
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{
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if (Other->IsKind(STANDARD_TYPE(Expr_LogOf10))) {
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Handle(Expr_GeneralExpression) myexp = Operand();
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return myexp->IsIdentical(Other->SubExpression(1));
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}
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return Standard_False;
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}
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Standard_Boolean Expr_LogOf10::IsLinear () const
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{
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return !ContainsUnknowns();
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}
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Handle(Expr_GeneralExpression) Expr_LogOf10::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) myexp = Operand();
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Handle(Expr_GeneralExpression) myder = myexp->Derivative(X);
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Standard_Real vlog = Log(10.0);
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Handle(Expr_NumericValue) vallog = new Expr_NumericValue(vlog);
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Handle(Expr_Product) theprod = Expr::CopyShare(myexp) * vallog;
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Handle(Expr_Division) thediv = myder / theprod->ShallowSimplified();
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return thediv->ShallowSimplified();
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}
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Standard_Real Expr_LogOf10::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
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{
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return ::Log10(Operand()->Evaluate(vars,vals));
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}
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TCollection_AsciiString Expr_LogOf10::String() const
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{
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TCollection_AsciiString str("log(");
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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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