说明：  RKN1210 12th/10th order Runge-Kutta-Nystr?m integrator RKN1210() is a 12th/10th order variable-step numerical integrator for second-order ordinary differential equations of the form y'' = f(t, y) (1) with initial conditions y(t0) = y0 y'(t0) = yp0 (2) This second-order differential equation is integrated with a Runge-Kutta-Nystr?m method using 17 function evaluations per step. RKN12(10) is a very high-order method, to be used in problems with *extremely* stringent error tolerances.
(12th/10th order variable-step numerical integrator for second-order ordinary differential equations of the form y'' = f(t, y) (1) with initial conditions)