Korrektur pendulum-3.c

20181119/pendulum-3.c

@@ -55,7 +55,7 @@ gboolean timer (GtkWidget *widget)
 {
   t += dt;
   phi_with_sin += omega_with_sin * dt;
-  omega_with_sin += - dt * g / l * phi_with_sin;
+  omega_with_sin += - dt * g / l * sin (phi_with_sin);
   phi_without_sin += omega_without_sin * dt;
   omega_without_sin += - dt * g / l * phi_without_sin;