123   PetscReal **au, dx, dy, x, y;  in FormExactSolution()  local
127   dy = 4.0 / (PetscReal)(info->my - 1);  in FormExactSolution()
130     y = -2.0 + j * dy;  in FormExactSolution()
145   PetscReal   **aXl, dx, dy, x, y;  in FormBounds()  local
151   dy = 4.0 / (PetscReal)(info.my - 1);  in FormBounds()
154     y = -2.0 + j * dy;  in FormBounds()
168   PetscReal dx, dy, x, y, ue, un, us, uw;  in FormFunctionLocal()  local
172   dy = 4.0 / (PetscReal)(info->my - 1);  in FormFunctionLocal()
174     y = -2.0 + j * dy;  in FormFunctionLocal()
182         us       = (j - 1 == 0) ? u_exact(x, y - dy) : au[j - 1][i];  in FormFunctionLocal()
183         un       = (j + 1 == info->my - 1) ? u_exact(x, y + dy) : au[j + 1][i];  in FormFunctionLocal()
184         af[j][i] = -(dy / dx) * (uw - 2.0 * au[j][i] + ue) - (dx / dy) * (us - 2.0 * au[j][i] + un);  in FormFunctionLocal()
196   PetscReal  v[5], dx, dy, oxx, oyy;  in FormJacobianLocal()  local
200   dy  = 4.0 / (PetscReal)(info->my - 1);  in FormJacobianLocal()
201   oxx = dy / dx;  in FormJacobianLocal()
202   oyy = dx / dy;  in FormJacobianLocal()