帮我用matlab写一段蚁群算法代码

好的，以下是一段 MATLAB 代码，实现了简单的蚁群算法：

``` % 蚁群算法求解TSP问题

% 设置城市数量和距离矩阵 cityNum = 20; distance = round(rand(cityNum, cityNum) * 100); distance = distance + distance'; for i = 1:cityNum distance(i,i) = 0; end

% 设置蚂蚁数量、信息素含量、迭代次数等参数 antNum = 30; alpha = 1; beta = 2; rho = 0.1; iterNum = 500;

% 初始化信息素矩阵 pheromone = ones(cityNum, cityNum);

% 进行迭代 for i = 1:iterNum % 对每只蚂蚁，构造路径 for j = 1:antNum % 初始化蚂蚁的路径和路径长度 antPath = zeros(1, cityNum); antPathLength = 0; % 初始化蚂蚁的当前城市 currentCity = ceil(rand * cityNum); unvisitedCity = ones(1, cityNum); unvisitedCity(currentCity) = 0; antPath(1) = currentCity; % 构造路径 for k = 2:cityNum nextCity = nextCityProb(currentCity, unvisitedCity, pheromone, distance, alpha, beta); antPathLength