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_Division.hxx>
20 #include <Expr_GeneralExpression.hxx>
21 #include <Expr_LogOf10.hxx>
22 #include <Expr_NamedUnknown.hxx>
23 #include <Expr_Operators.hxx>
24 #include <Expr_Product.hxx>
25 #include <Standard_Type.hxx>
26 #include <TCollection_AsciiString.hxx>
28 IMPLEMENT_STANDARD_RTTIEXT(Expr_LogOf10,Expr_UnaryExpression)
30 Expr_LogOf10::Expr_LogOf10(const Handle(Expr_GeneralExpression)& exp)
35 Handle(Expr_GeneralExpression) Expr_LogOf10::ShallowSimplified () const
37 Handle(Expr_GeneralExpression) myexp = Operand();
38 if (myexp->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
39 Handle(Expr_NumericValue) myNVexp = Handle(Expr_NumericValue)::DownCast(myexp);
40 return new Expr_NumericValue(Log10(myNVexp->GetValue()));
42 Handle(Expr_LogOf10) me = this;
46 Handle(Expr_GeneralExpression) Expr_LogOf10::Copy () const
48 return new Expr_LogOf10(Expr::CopyShare(Operand()));
51 Standard_Boolean Expr_LogOf10::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
53 if (Other->IsKind(STANDARD_TYPE(Expr_LogOf10))) {
54 Handle(Expr_GeneralExpression) myexp = Operand();
55 return myexp->IsIdentical(Other->SubExpression(1));
57 return Standard_False;
60 Standard_Boolean Expr_LogOf10::IsLinear () const
62 return !ContainsUnknowns();
65 Handle(Expr_GeneralExpression) Expr_LogOf10::Derivative (const Handle(Expr_NamedUnknown)& X) const
68 return new Expr_NumericValue(0.0);
70 Handle(Expr_GeneralExpression) myexp = Operand();
71 Handle(Expr_GeneralExpression) myder = myexp->Derivative(X);
72 Standard_Real vlog = Log(10.0);
73 Handle(Expr_NumericValue) vallog = new Expr_NumericValue(vlog);
74 Handle(Expr_Product) theprod = Expr::CopyShare(myexp) * vallog;
75 Handle(Expr_Division) thediv = myder / theprod->ShallowSimplified();
76 return thediv->ShallowSimplified();
79 Standard_Real Expr_LogOf10::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
81 return ::Log10(Operand()->Evaluate(vars,vals));
84 TCollection_AsciiString Expr_LogOf10::String() const
86 TCollection_AsciiString str("log(");
87 str += Operand()->String();