DiagonalMatrix.C

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#include "DiagonalMatrix.H"

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

template<class Type>
template<class Form>
Foam::DiagonalMatrix<Type>::DiagonalMatrix(const Matrix<Form, Type>& a)
:
    List<Type>(min(a.n(), a.m()))
{
    forAll(*this, i)
    {
        this->operator[](i) = a[i][i];
    }
}


template<class Type>
Foam::DiagonalMatrix<Type>::DiagonalMatrix(const label size)
:
    List<Type>(size)
{}


template<class Type>
Foam::DiagonalMatrix<Type>::DiagonalMatrix(const label size, const Type& val)
:
    List<Type>(size, val)
{}


template<class Type>
Foam::DiagonalMatrix<Type>& Foam::DiagonalMatrix<Type>::invert()
{
    forAll(*this, i)
    {
        Type x = this->operator[](i);
        if (mag(x) < VSMALL)
        {
            this->operator[](i) = Type(0);
        }
        else
        {
            this->operator[](i) = Type(1)/x;
        }
    }

    return this;
}


template<class Type>
Foam::DiagonalMatrix<Type> Foam::inv(const DiagonalMatrix<Type>& A)
{
    DiagonalMatrix<Type> Ainv = A;

    forAll(A, i)
    {
        Type x = A[i];
        if (mag(x) < VSMALL)
        {
            Ainv[i] = Type(0);
        }
        else
        {
            Ainv[i] = Type(1)/x;
        }
    }

    return Ainv;
}


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