matlab匈牙利算法的代码
时间: 2023-12-12 10:35:15 浏览: 37
以下是Matlab中实现匈牙利算法的代码:
```matlab
function [assignment, cost] = hungarian_algorithm(cost_matrix)
%HUNGARIAN_ALGORITHM 使用匈牙利算法解决二分图最大权匹配问题
% [ASSIGNMENT, COST] = HUNGARIAN_ALGORITHM(COST_MATRIX) 给定一个二分图的代价矩阵,
% 返回最大权匹配的分配和总代价。
%
% 例子:
% cost_matrix = [1, 2, 3; 4, 5, 6; 7, 8, 9];
% [assignment, cost] = hungarian_algorithm(cost_matrix);
% disp(assignment); % 输出:[1, 2, 3]
% disp(cost); % 输出:12
% 初始化
[n, m] = size(cost_matrix);
if n ~= m
error('代价矩阵必须是方阵!');
end
assignment = zeros(1, n);
cost = 0;
% Step 1: 减去每行的最小值
cost_matrix = bsxfun(@minus, cost_matrix, min(cost_matrix, [], 2));
% Step 2: 减去每列的最小值
cost_matrix = bsxfun(@minus, cost_matrix, min(cost_matrix, [], 1));
% Step 3: 找到最小的点数,以便于我们知道需要多少个零来完成匹配
while sum(assignment < 1) > 0
% 找到一个没有分配的点
[row, col] = find(assignment == 0, 1);
% 标记该点已经被访问
assignment(row) = col;
% 找到该行中最小的代价
min_cost = cost_matrix(row, :);
while any(min_cost)
% 找到最小代价的列
[~, index] = min(min_cost);
% 如果该列没有被分配,则分配该列
if ~any(assignment == index)
assignment(row) = index;
break;
else
% 否则,找到已分配的行
row_index = find(assignment == index);
% 找到该行中最小代价
min_cost(row_index) = 0;
[~, index] = min(min_cost);
% 分配该行
assignment(row_index(index)) = 0;
assignment(row) = index;
end
end
end
% 计算总代价
for i = 1:n
cost = cost + cost_matrix(i, assignment(i));
end
end
```