Calculate_JOR_preconditioner Function

public function Calculate_JOR_preconditioner(A, omega, alpha) result(D)

Arguments

Type IntentOptional Attributes Name
real(kind=dp), intent(in), dimension(:, :) :: A
real(kind=dp), intent(in) :: omega
real(kind=dp), intent(in) :: alpha

Return Value real(kind=dp), dimension(size(A, 1), size(A, 2))


Calls

proc~~calculate_jor_preconditioner~~CallsGraph proc~calculate_jor_preconditioner Calculate_JOR_preconditioner proc~diag Diag proc~calculate_jor_preconditioner->proc~diag

Source Code

    function Calculate_JOR_preconditioner(A, omega, alpha) result(D)
        real(dp), dimension(:, :), intent(in) :: A
        real(dp), intent(in) :: omega, alpha
        real(dp), dimension(size(A, 1), size(A, 2)) :: D
        integer :: N, i

        N = size(A, 1)

        D = 0.d0

        if (any(Diag(A) < TOL_CONVERGENCE_dp)) stop "ERROR :: Zero diagonal in JOR preconditioner"
        forall (i=1:size(A, 1)) D(i, i) = omega / A(i, i)

        D = D / alpha

    end function Calculate_JOR_preconditioner