图论——Dijkstra算法matlab代码

Dijkstra算法步骤
（1）构造邻接矩阵
（2）定义起始点
（3）运行代码

M=[  0     5     9   Inf   Inf   Inf   Inf
   Inf     0   Inf   Inf    12   Inf   Inf
   Inf     3     0    15   Inf    23   Inf
   Inf     6   Inf     0   Inf     8     7
   Inf    12   Inf     5     0   Inf    14
   Inf   Inf   Inf   Inf   Inf     0    10
   Inf   Inf   Inf   Inf   Inf   Inf     0];
first=2;
last=4;
[m,n]=size(M);
L=zeros(1,m);
symbol=zeros(1,m);
direction=zeros(1,m);
for i=1:m
    if(i~=first)
        L(i)=inf;
    end
    direction(i)=first;
end
judge=1;
while judge
for i=1:m
    if(symbol(i)==0)
        min=L(i);
        temporary=i;
        break
    end
end
for i=1:m
    if(symbol(i)==0)
        if(L(i)