说明：  用粒子群算法处理带约束问题，处理约束条件使用的是罚函数法，代码中附有中文注释，txstA.txt文件是约束函数的系数组成的矩阵
(Particle swarm algorithm is applied to deal with the constrained problem. The penalty function is applied to deal with the constraint condition. The code is accompanied by Chinese annotation. The txstA.txt file is the matrix of the constraint function's coefficient.)