用指数龙格库塔方法求解时滞（延迟）微分方程！,Using index method Runge-Kutta time-delay (delay) differential equations!

This file conclude of five codes , four of them in Mathematica program and one in C++. 1. Erk4.nb. this code represent the explicit Runge Kutta method of order four for solving first order ODE. 2. RK45.nb This code represent the Embedded Runge Ku