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) < epsi)) 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