都是matlab编写的，需要的同志们赶快下吧，会对你用的-Matlab are prepared and need to quickly comrades under the bar, would you use the

程序为用matlab编写的改进粒子群算法求解25杆件截面优化程序，程序的通用性很强！-Procedures using matlab improved particle swarm optimization for 25 cross-section optimization program, the program' s very versatile!