说明：  多刚体动力学matlb编程 用辛方法 Fully vectorized n-body equation nbodyVect(x0,dx0,mus,t) integrates the n-body equations of motion using either a symplectic second order integrator, or any of the standard built-in or user supplied first order integrators.
(Programming multi-body dynamics with symplectic methods matlb Fully vectorized n-body equation nbodyVect (x0, dx0, mus, t) integrates the n-body equations of motion using either a symplectic second order integrator, or any of the standard built-in or user supplied first order integrators.)