％--- 名称：带交叉因子的改进PSO算法

％------功能：求解多维无约束优化问题

％------特点：收敛性强，还可以加入变异算子

---- Name: with cross-factor function to improve the PSO algorithm------: Solving multi-dimensional unconstrained optimization problems------ characteristics: strong convergence, but also joined the mutation operator can