说明：  这是基本的粒子群优化算法程序，用Matlab实现，是主函数的源程序，对不同的优化函数只要修改fitness.m就可以了通用性很强。
(This is basic particle swarm optimization procedures, using Matlab realize, is very simple. Is the main function of the source, optimizing the function with m the form of documents on fitness.m inside,)