sides_rb Subroutine

  subroutine sides_rb(box, nc, iv, nb, gc)
    type(mg_box_t), intent(inout) :: box
    integer, intent(in)       :: nc
    integer, intent(in)       :: iv
    integer, intent(in)       :: nb
    !< Ghost cell direction
    !> Interpolated coarse grid ghost cell data (but not yet in the nb direction)
    real(dp), intent(in)      :: gc(nc)
    integer                   :: di, dj
    integer                   :: i, j, ix, dix

    if (mg_neighb_low(nb)) then
       ix = 1
       dix = 1
    else
       ix = nc
       dix = -1
    end if

    select case (mg_neighb_dim(nb))
    case (1)
       i = ix
       di = dix

       do j = 1, nc
          dj = -1 + 2 * iand(j, 1)
          box%cc(i-di, j, iv) = 0.5_dp * gc(j) + 0.75_dp * box%cc(i, j,&
              iv) - 0.25_dp * box%cc(i+di, j, iv)
       end do
    case (2)
       j = ix
       dj = dix
       do i = 1, nc
          di = -1 + 2 * iand(i, 1)
          box%cc(i, j-dj, iv) = 0.5_dp * gc(i) + 0.75_dp * box%cc(i, j,&
              iv) - 0.25_dp * box%cc(i, j+dj, iv)
       end do
    end select

  end subroutine sides_rb