24   PetscReal dy;      /* the grid space in y-direction */  member
65   data.dy      = 1.0 / (data.n + 1.0);  in main()
199   PetscReal    x, y, dx, dy;  in Initial()  local
207   dy = data->dy;  in Initial()
220     y           = dy * col;  in Initial()
277   PetscReal   dx, dy, a, epsilon, xc, xl, xr, yl, yr;  in RHSJacobian()  local
284   dy      = data->dy;  in RHSJacobian()
288   xc = -2.0 * epsilon * (1.0 / (dx * dx) + 1.0 / (dy * dy));  in RHSJacobian()
291   yl = 0.5 * a / dy + epsilon / (dy * dy);  in RHSJacobian()
292   yr = -0.5 * a / dy + epsilon / (dy * dy);  in RHSJacobian()
405   PetscReal          dx, dy;  in RHSFunction()  local
421   dy      = data->dy;  in RHSFunction()
425   xc = -2.0 * epsilon * (1.0 / (dx * dx) + 1.0 / (dy * dy));  in RHSFunction()
428   yl = 0.5 * a / dy + epsilon / (dy * dy);  in RHSFunction()
429   yr = -0.5 * a / dy + epsilon / (dy * dy);  in RHSFunction()