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//static const char* sccsid = "@(#)Expr_SquareRoot.cxx 3.2 95/01/10"; // Do not delete this line. Used by sccs.
// Copyright: Matra-Datavision 1991
// File: Expr_Root.cxx
// Created: Tue May 28 12:39:37 1991
// Author: Arnaud BOUZY
// <adn>
#include <Expr_SquareRoot.ixx>
#include <Expr_NumericValue.hxx>
#include <Expr_Square.hxx>
#include <Expr_Product.hxx>
#include <Expr_Division.hxx>
#include <Expr_Operators.hxx>
#include <Expr.hxx>
Expr_SquareRoot::Expr_SquareRoot (const Handle(Expr_GeneralExpression)& exp)
{
CreateOperand(exp);
}
Handle(Expr_GeneralExpression) Expr_SquareRoot::ShallowSimplified () const
{
Handle(Expr_GeneralExpression) myexp = Operand();
if (myexp->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
Handle(Expr_NumericValue) myNVexp = Handle(Expr_NumericValue)::DownCast(myexp);
return new Expr_NumericValue(Sqrt(myNVexp->GetValue()));
}
if (myexp->IsKind(STANDARD_TYPE(Expr_Square))) {
return myexp->SubExpression(1);
}
Handle(Expr_SquareRoot) me = this;
return me;
}
Handle(Expr_GeneralExpression) Expr_SquareRoot::Copy () const
{
return new Expr_SquareRoot(Expr::CopyShare(Operand()));
}
Standard_Boolean Expr_SquareRoot::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
{
if (Other->IsKind(STANDARD_TYPE(Expr_SquareRoot))) {
return Operand()->IsIdentical(Other->SubExpression(1));
}
return Standard_False;
}
Standard_Boolean Expr_SquareRoot::IsLinear () const
{
return !ContainsUnknowns();
}
Handle(Expr_GeneralExpression) Expr_SquareRoot::Derivative (const Handle(Expr_NamedUnknown)& X) const
{
if (!Contains(X)) {
return new Expr_NumericValue(0.0);
}
Handle(Expr_GeneralExpression) myexp = Operand();
Handle(Expr_GeneralExpression) myder = myexp->Derivative(X);
Handle(Expr_SquareRoot) sq = new Expr_SquareRoot(Expr::CopyShare(myexp));
Handle(Expr_Product) theprod = 2.0 * sq;
Handle(Expr_Division) resu = myder / theprod->ShallowSimplified();
return resu->ShallowSimplified();
}
Standard_Real Expr_SquareRoot::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
{
return ::Sqrt(Operand()->Evaluate(vars,vals));
}
TCollection_AsciiString Expr_SquareRoot::String() const
{
TCollection_AsciiString str("Sqrt(");
str += Operand()->String();
str += ")";
return str;
}
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