SquareMatrix.C

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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 2013 OpenFOAM Foundation
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#include "SquareMatrix.H"
#include "labelList.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
template<class Type>
Foam::scalar Foam::detDecomposed
(
    const SquareMatrix<Type>& matrix,
    const label sign
)
{
    scalar diagProduct = 1.0;
 
    for (label i = 0; i < matrix.n(); ++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.n());
    label sign;
    LUDecompose(matrixTmp, pivotIndices, sign);
 
    return detDecomposed(matrixTmp, sign);
}
 
 
template<class Type>
Foam::scalar Foam::det(SquareMatrix<Type>& matrix)
{
    labelList pivotIndices(matrix.n());
    label sign;
    LUDecompose(matrix, pivotIndices, sign);
 
    return detDecomposed(matrix, sign);
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //