Function pendulum::logger::energy::check

pub fn check(p: &Pendulum) -> Energy

Calculate energies of the current state.

The kinetic and the potential energies are computed following the definition. The (non-dimensional) potential energy is computed with repsect to the quiescent state. Since I fix the initial condition in crate::simulator::init, the expected total energy is known a propri. This value is used to normalise the total value.