为了解决复杂网络中微分方程求解速度慢的问题，自己编写了求解微分方程的定步长ode4文件。速度快，精度高-In order to solve the differential equation to solve complex network problems of slow, their preparation for solving differential equations fixed step ode4 file. Speed, high precision

四阶定步长龙格库塔法，可用于变参微分方程组，亲测可用。。。。。(runge-kutta fixed-step)

在matlab平台中，定步长，解3-4阶常微分方程组(Solution of ordinary differential equation)