资源简介
MATLAB中的dijkstra(迪杰斯特拉)最短路径算法。求最短路径的普遍算法
代码片段和文件信息
clc;
clear all;
disp(‘DIJKISTRA ALGORITHM‘);
n=input(‘Enter the no. of nodes: ‘);
for i=1:n
%initialize
for j=i:n
if(i==j)
m(ij)=0;
else
m(ij)=randint(119);% fill matrix
m(ji)=m(ij);% equal upper and lower triangular matrix
end
end
end
disp(m);
i=1;
x=1;
temp=triu(m); %for coloring of the lines after computing path
for i=1:n
for j=1:n
if(temp(ij)~=0)
lc(ij)=x; %just numbering in sequence for line count
lc(ji)=lc(ij);
x=x+1;
end
end
end
bg=biograph(triu(m)[]‘showarrows‘‘off‘‘ShowWeights‘‘on‘‘EdgeTextColor‘[0 0 1]);
view(bg);
over=0;
while(over==0)
from=input(‘Enter the source node no.: ‘); %get inputs
to=input(‘Enter the destination node no.: ‘);
v=zeros(1n);%visited matrix
d=randint(1n100);%distance to node matrix
p=zeros(1n);%previous node matrix
s=from;
v(s)=1;%mark from as visited and initialixe d and p with 0
d(s)=0;
p(s)=0;
stop=0;
while(stop~=n)
stop=0;
for i=1:n
if(v(i)~=1&&m(si)~=0)
if(d(s)+m(si) d(i)=m(si)+d(s);
p(i)=s;
end
else
stop=stop+1;
end
end
tempmat=d;
for i=1:n
if(v(i)==1)
tempmat(i)=100;%to find the next minimum
end
end
[k z]=min(tempmat);
s=z;% next minimum node as source node
v(s)=1; % mark as visited
end
%%%%%%%%%%%%%%%%%%%%%%%%%computation over%%%%%%%%%%%%%%%%%
no=1:n;
fprintf(‘\nNodes: ‘);
disp(no);
fprintf(‘Visited: ‘);
disp(v);
fprintf(‘Previous:‘);
disp(p);
i=1;
out=2;
dest(1)=to;
while(i==1) %backtrace from destination to source
to=p(to);
dest(out)=to;
out=out+1;
if(to==from)
i=0;
end
end
bg=biograph(triu(m)[]‘showarrows‘‘off‘‘ShowWeights‘‘on‘‘EdgeTextColor‘[0 0 1]);
for i=1:out-1
set(bg.nodes(dest(i)) ‘color‘ [1 0 0]);
set(bg.nodes(dest(1))‘color‘[0 1 0]);
if(i set(bg.edges(lc(dest(i+1)dest(i)))‘linecolor‘[1 0 0]);
end
end
view(bg);
sample=input(‘Check Minimum distance for next instance y/n: ‘‘s‘);
if(sample==‘n‘)
over=1;
end
end
属性 大小 日期 时间 名称
----------- --------- ---------- ----- ----
目录 0 2018-07-24 16:03 dijkstra\
文件 2265 2014-10-02 18:19 dijkstra.m
文件 2261 2018-07-24 16:06 dijkstra\dijkstra.m
文件 1310 2014-10-02 18:19 dijkstra\license.txt
文件 1310 2014-10-02 18:19 license.txt
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