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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2026 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
\*---------------------------------------------------------------------------*/
#include "Polynomial1.H"
// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
template<class Type>
Foam::List<Type> Foam::Function1s::Polynomial<Type>::convertRead
(
const unitSets& units,
List<Type> coeffs
)
{
unitSet unitsXPowI(units.x);
forAll(coeffs, i)
{
coeffs[i] = units.value.toStandard(unitsXPowI.toUser(coeffs[i]));
unitsXPowI.reset(units.x*unitsXPowI);
}
return coeffs;
}
template<class Type>
Foam::List<Type> Foam::Function1s::Polynomial<Type>::convertWrite
(
const unitSets& units,
List<Type> coeffs
)
{
unitSet unitsXPowI(units.x);
forAll(coeffs, i)
{
coeffs[i] = units.value.toUser(unitsXPowI.toStandard(coeffs[i]));
unitsXPowI.reset(units.x*unitsXPowI);
}
return coeffs;
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
template<class Type>
Foam::Function1s::Polynomial<Type>::Polynomial
(
const word& name,
const unitSets& units,
const dictionary& dict
)
:
FieldFunction1<Type, Polynomial<Type>>(name),
coeffs_
(
convertRead
(
dict.found("units")
? Function1s::unitSets(dict.lookup("units"))
: units,
dict.lookup("coeffs")
)
)
{
if (!coeffs_.size())
{
FatalIOErrorInFunction(dict)
<< typeName.capitalise() << ' ' << name
<< " must have at least one coefficient"
<< exit(FatalError);
}
}
template<class Type>
Foam::Function1s::Polynomial<Type>::Polynomial
(
const word& name,
const unitSets& units,
Istream& is
)
:
FieldFunction1<Type, Polynomial<Type>>(name),
coeffs_(convertRead(units, is))
{
if (!coeffs_.size())
{
FatalIOErrorInFunction(is)
<< typeName.capitalise() << ' ' << name
<< " must have at least one coefficient"
<< exit(FatalError);
}
}
template<class Type>
Foam::Function1s::Polynomial<Type>::Polynomial(const Polynomial& poly)
:
FieldFunction1<Type, Polynomial<Type>>(poly),
coeffs_(poly.coeffs_)
{}
// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
template<class Type>
Foam::Function1s::Polynomial<Type>::~Polynomial()
{}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
template<class Type>
Type Foam::Function1s::Polynomial<Type>::value(const scalar x) const
{
Type y = coeffs_[coeffs_.size() - 1];
for (label i = coeffs_.size() - 2; i >= 0; i --)
{
y = y*x + coeffs_[i];
}
return y;
}
template<class Type>
Type Foam::Function1s::Polynomial<Type>::derivative(const scalar x) const
{
Type y = coeffs_[coeffs_.size() - 1]*(coeffs_.size() - 1);
for (label i = coeffs_.size() - 2; i >= 1; i --)
{
y = y*x + coeffs_[i]*i;
}
return y;
}
template<class Type>
Type Foam::Function1s::Polynomial<Type>::integral
(
const scalar x1,
const scalar x2
) const
{
Type Sy1 = coeffs_[coeffs_.size() - 1]/coeffs_.size(), Sy2 = Sy1;
for (label i = coeffs_.size() - 2; i >= 0; i --)
{
Sy1 = Sy1*x1 + coeffs_[i]/(i + 1);
Sy2 = Sy2*x2 + coeffs_[i]/(i + 1);
}
return x2*Sy2 - x1*Sy1;
}
template<class Type>
void Foam::Function1s::Polynomial<Type>::write
(
Ostream& os,
const unitSets& units
) const
{
writeEntry(os, "coeffs", convertWrite(units, coeffs_));
}
// ************************************************************************* //
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