33   PetscInt  mx;    /* Discretization in x-direction */  member
58   user.mx    = 4;  in main()
65   PetscCall(PetscOptionsGetInt(NULL, NULL, "-mx", &user.mx, NULL));  in main()
67   N  = user.mx * user.my;  in main()
68   dt = .5 / PetscMax(user.mx, user.my);  in main()
181   PetscInt     i, j, row, mx, my;  in FormInitialGuess()  local
187   mx     = user->mx;  in FormInitialGuess()
191   hx = one / (PetscReal)(mx - 1);  in FormInitialGuess()
198     for (i = 0; i < mx; i++) {  in FormInitialGuess()
199       row = i + j * mx;  in FormInitialGuess()
200       if (i == 0 || j == 0 || i == mx - 1 || j == my - 1) {  in FormInitialGuess()
204       x[row] = temp1 * PetscSqrtReal(PetscMin((PetscReal)(PetscMin(i, mx - i - 1)) * hx, temp));  in FormInitialGuess()
215   PetscInt           i, j, row, mx, my;  in FormFunction()  local
222   mx     = user->mx;  in FormFunction()
226   hx    = one / (PetscReal)(mx - 1);  in FormFunction()
235     for (i = 0; i < mx; i++) {  in FormFunction()
236       row = i + j * mx;  in FormFunction()
237       if (i == 0 || j == 0 || i == mx - 1 || j == my - 1) {  in FormFunction()
242       ub     = x[row - mx];  in FormFunction()
244       ut     = x[row + mx];  in FormFunction()
268   PetscInt           i, j, row, mx, my, col[5];  in FormJacobian()  local
274   mx     = user->mx;  in FormJacobian()
278   hx    = 1.0 / (PetscReal)(mx - 1);  in FormJacobian()
286     for (i = 0; i < mx; i++) {  in FormJacobian()
287       row = i + j * mx;  in FormJacobian()
288       if (i == 0 || j == 0 || i == mx - 1 || j == my - 1) {  in FormJacobian()
293       col[0] = row - mx;  in FormJacobian()
301       col[4] = row + mx;  in FormJacobian()