Fix v X B

include/PenningTrap.hpp

@@ -75,6 +75,10 @@ public:
     /** @brief Go forward one timestep using the forward Euler method
      * */
     void evolve_forward_euler(double dt);
+
+    arma::vec get_particle(int i);
+
+    double get_d();
 };
 
 #endif