迪杰斯特拉算法matlab
时间: 2023-10-16 12:09:41 浏览: 73
以下是Dijkstra算法的Matlab代码实现:
```matlab
function [dist, path] = Dijkstra(graph, start, dest)
% Dijkstra算法求解单源最短路径
% 输入参数:graph-邻接矩阵,start-起点,dest-终点
% 输出参数:dist-最短距离,path-最短路径
n = size(graph, 1); % 图的大小
dist = Inf(1, n); % 初始化距离
visited = zeros(1, n); % 初始化visited
prev = zeros(1, n); % 初始化prev
dist(start) = 0;
for i = 1:n-1
min_dist = Inf;
for j = 1:n
if ~visited(j) && dist(j)<min_dist
min_dist = dist(j);
u = j;
end
end
visited(u) = 1;
for v = 1:n
if ~visited(v) && (graph(u, v)~=Inf) && (dist(u)+graph(u, v)<dist(v))
dist(v) = dist(u) + graph(u, v);
prev(v) = u;
end
end
end
path = [];
if dist(dest)~=Inf
t = dest;
while t~=start
path = [t path];
t = prev(t);
end
path = [start path];
end
end
```
其中,输入参数graph为邻接矩阵,start和dest分别为起点和终点。输出参数dist为最短距离,path为最短路径。具体实现过程为:
1. 初始化距离dist数组为Inf,visited数组为0,prev数组为0;
2. 将起点start的距离dist[start]赋值为0;
3. for循环n-1次,每次选择未访问节点中dist最小的节点u,将visited[u]设为1;
4. for循环所有节点v,如果v未访问且u到v的距离更短,则更新dist[v]和prev[v];
5. 循环结束后,如果终点dest的距离dist[dest]不为Inf,则输出最短路径。
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