DiagonalMatrix.C

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    Copyright (C) 2019 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
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#include "DiagonalMatrix.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
template<class Type>
inline Foam::DiagonalMatrix<Type>::DiagonalMatrix()
:
    List<Type>()
{}
 
 
template<class Type>
Foam::DiagonalMatrix<Type>::DiagonalMatrix(const label n)
:
    List<Type>(n)
{}
 
 
template<class Type>
Foam::DiagonalMatrix<Type>::DiagonalMatrix(const label n, const zero)
:
    List<Type>(n, Zero)
{}
 
 
template<class Type>
Foam::DiagonalMatrix<Type>::DiagonalMatrix(const label n, const Type& val)
:
    List<Type>(n, val)
{}
 
 
template<class Type>
template<class Form>
Foam::DiagonalMatrix<Type>::DiagonalMatrix(const Matrix<Form, Type>& mat)
:
    List<Type>(min(mat.m(), mat.n()))
{
    label i = 0;
 
    for (Type& val : *this)
    {
        val = mat(i, i);
        ++i;
    }
}
 
 
template<class Type>
Foam::DiagonalMatrix<Type>& Foam::DiagonalMatrix<Type>::invert()
{
    for (Type& val : *this)
    {
        if (mag(val) < VSMALL)
        {
            val = Zero;
        }
        else
        {
            val = Type(1)/val;
        }
    }
 
    return this;
}
 
 
template<class Type>
Foam::DiagonalMatrix<Type> Foam::inv(const DiagonalMatrix<Type>& mat)
{
    DiagonalMatrix<Type> Ainv(mat.size());
 
    Type* iter = Ainv.begin();
 
    for (const Type& val : mat)
    {
        if (mag(val) < VSMALL)
        {
            *iter = Zero;
        }
        else
        {
            *iter = Type(1)/val;
        }
 
        ++iter;
    }
 
    return Ainv;
}
 
 
// ************************************************************************* //