利用粒子群算法计算某一函数的最大值，直接运行main.m文件即可，fun.m用于计算粒子适用度，目标函数可根据自身需要进行修改。(Use particle swarm algorithm to calculate the maximum value of a function, just run the main.m file directly. Fun.m is used to calculate the applicability of the particles. The objective function can be modified according to its own needs.)