SquareMatrix.C

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#include "SquareMatrix.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);
}


// ************************************************************************* //