Removed a println

readme.md

@@ -30,7 +30,8 @@ and field line tracing:
 
 ## To Use
 
-For now, here is a simple example of using the propagator to solve a simple system:
+For now, here is a simple example of using the propagator to solve a simple second-order system (the
+pendulum problem):
 
 ```rust
 use nalgebra::Vector2;

src/problem.rs

@@ -55,7 +55,6 @@ where
             if self.callbacks.len() > 0 {
                 // Check for events occurring
                 for callback in &self.callbacks {
-                    println!("{}", (callback.event)(self.ode.t, self.ode.y, &self.ode.params) * (callback.event)(self.ode.t + step, new_y, &self.ode.params));
                     if (callback.event)(self.ode.t, self.ode.y, &self.ode.params) * (callback.event)(self.ode.t + step, new_y, &self.ode.params) < 0.0 {
                         // If the event crossed zero, then find the root
                         let f = |test_t| {