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// File: FEmTool_ElementsOfRefMatrix.cxx
// Created: Tue Nov 10 12:58:16 1998
// Author: Igor FEOKTISTOV
// <ifv@paradox.nnov.matra-dtv.fr>
#include <FEmTool_ElementsOfRefMatrix.ixx>
#include <PLib_Base.hxx>
#include <TColStd_Array1OfReal.hxx>
FEmTool_ElementsOfRefMatrix::FEmTool_ElementsOfRefMatrix(const Handle(PLib_Base)& TheBase,
const Standard_Integer DerOrder):
myBase(TheBase)
{
if(DerOrder < 0 || DerOrder > 3)
Standard_ConstructionError::Raise("FEmTool_ElementsOfRefMatrix");
myDerOrder = DerOrder;
myNbEquations = (myBase->WorkDegree()+2)*(myBase->WorkDegree()+1)/2;
}
Standard_Integer FEmTool_ElementsOfRefMatrix::NbVariables() const
{
return 1;
}
Standard_Integer FEmTool_ElementsOfRefMatrix::NbEquations() const
{
return myNbEquations;
}
Standard_Boolean FEmTool_ElementsOfRefMatrix::Value(const math_Vector& X, math_Vector& F)
{
if(F.Length() < myNbEquations) Standard_OutOfRange::Raise("FEmTool_ElementsOfRefMatrix::Value");
Standard_Real u = X(X.Lower());
TColStd_Array1OfReal Basis(0,myBase->WorkDegree()), Aux(0,myBase->WorkDegree());
switch (myDerOrder) {
case 0 :
myBase->D0(u, Basis);
break;
case 1 :
myBase->D1(u, Aux, Basis);
break;
case 2 :
myBase->D2(u, Aux, Aux, Basis);
break;
case 3 :
myBase->D3(u, Aux, Aux, Aux, Basis);
break;
}
Standard_Integer i, j, ii = 0;
for(i = 0; i<=myBase->WorkDegree(); i++)
for(j = i; j<=myBase->WorkDegree(); j++) {
F(F.Lower()+ii) = Basis(i)*Basis(j); ii++;
}
return Standard_True;
}
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