SquareMatrix.C

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    Copyright (C) 2013-2016 OpenFOAM Foundation
    Copyright (C) 2019 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
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    for more details.
 
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#include "SquareMatrix.H"
#include "RectangularMatrix.H"
#include "labelList.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
template<class Type>
Foam::scalar Foam::detDecomposed
(
    const SquareMatrix<Type>& matrix,
    const label sign
)
{
    Type diagProduct = pTraits<Type>::one;
 
    for (label i = 0; i < matrix.m(); ++i)
    {
        diagProduct *= matrix(i, i);
    }
 
    return sign*diagProduct;
}
 
 
template<class Type>
Foam::scalar Foam::det(const SquareMatrix<Type>& matrix)
{
    SquareMatrix<Type> matrixTmp = matrix;
 
    labelList pivotIndices(matrix.m());
    label sign;
    LUDecompose(matrixTmp, pivotIndices, sign);
 
    return detDecomposed(matrixTmp, sign);
}
 
 
template<class Type>
Foam::scalar Foam::det(SquareMatrix<Type>& matrix)
{
    labelList pivotIndices(matrix.m());
    label sign;
    LUDecompose(matrix, pivotIndices, sign);
 
    return detDecomposed(matrix, sign);
}
 
 
// * * * * * * * * * * * * * * * Member Operators  * * * * * * * * * * * * * //
 
template<class Type>
template<class AnyType>
void Foam::SquareMatrix<Type>::operator=(const Identity<AnyType>)
{
    Matrix<SquareMatrix<Type>, Type>::operator=(Zero);
 
    for (label i=0; i < this->n(); ++i)
    {
        this->operator()(i, i) = pTraits<Type>::one;
    }
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //