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function [tout, yout] = rk4(ypfun, tspan, y0, h) ％定步长四阶Runge-Kutta法求常微分方程(组)数值解 ％[tout,yout] = rk4( ypfun , tspan, y0,h) ％ 这里字符串ypfun是用以表示f(t, y)的M文件名, ％ tspan=[t0, tfinal]表示自变量初值t0和终值tf ％ y0表示初值向量y0，h是步长。 ％ 输出列向量tout表示节点 (t0 , t1 , … , tn) ％ 输出矩阵yout 表示数值解，每一列对应y的一个分量-function [tout, yout] = rk4 (ypfun. tspan, y0, h)% fixed step four-stage Runge- Kutta method for ordinary differential equations (Group) numerical solution% [tout. yout] = rk4 (ypfun, tspan, y0, h)% string ypfun here is used to indicate that f (t, y) M name, tspan% = [t0. tfinal] said variable initial and final t0 tf% y0 said initial vector y0, h is a step. % Output column vector tout said Node (t0, t1, ..., tn)% output matrix yout said numerical solution, each y counterparts out of a weight

一个简单的计算器程序-a simple calculator program

C++沉思录，一本由老外写的关于C++编程心得的书籍。比较经典，是初学者必看的一本书-C++ Meditation, one written by a foreigner on the C++ Programming experience books. Comparison of the classic is a must-see for beginners book

directx 9 的delphi驱动程序，如果能看懂会给你带来很大的好处，学习的好资料.-The driver of directX 9 in delphi, it will bring you very big benfit if you will read it, it is very nice.

XML2TreeView.rar ok

这个小程序可以获取windows版本号和运行模式！-This small program can obtain the windows version number and operating mode!

实例10-端口扫描-10-port scanning

intel线程挑战赛，tbb，多线程，并行，生命游戏，编程竞赛-intel Challenge thread, tbb, multi-threaded, parallel, Game of Life, programming contest

《Visual+C++案例开发》配套源代码 包括大案例和小案例（API绘图小案例，wav文件操作等）-" Visual+ C++ case development," the source code package including case and small case (API mapping of small cases, wav file operations, etc.)

停车场车库计算器。这被开发使用 c# 大学级别类。停车场车库计算器。这被开发使用 c# 大学级别类。