how to solve Dijkstra algorithm in MATLAB?

3 Ansichten (letzte 30 Tage)
Sivakumaran Chandrasekaran
Sivakumaran Chandrasekaran am 24 Aug. 2012
Beantwortet: Muhammad awan am 14 Nov. 2013
I used the command “graphshortestpath” to solve “Dijkstra”. I am not getting the correct answer as the output is concentrating on the reduction of nodes alone. I need to follow the path of reduced distance(between 2 nodes) alone.
My coding is for 24 nodes.
clc;
clear all;
close all;
W = [2.10 1.65 2.20 1.50 1.55 2 1.50 1.05 1.75 1.75 1.75 1 1 0.4 1.25 0.75 1.50 1.75 2 2 1.75 0.65 1.05 1.75 0.45 2.75 1.75 1.75 0.5 1.05 0.75 1 1.50 1.25 1 0.75 0.75 0.5 0.5 0.75 0.5];
DG = sparse([1 1 1 1 1 2 2 2 3 3 4 4 4 4 5 5 6 6 7 7 8 8 8 9 9 10 10 11 12 16 16 17 17 18 19 19 20 21 23 24 25],[2 3 4 16 19 5 6 17 6 7 7 8 12 24 9 18 9 10 10 11 7 22 23 10 25 13 14 13 21 2 17 5 18 15 4 20 12 22 11 3 14],W);
g=DG;
names=W;
h = view(biograph(DG,[],'ShowWeights','on'))
s=1;
d=input ('Enter the Destination node : ');
[dist,path,pred]=graphshortestpath(DG,s,d,'Directed',true,'method','Dijkstra');
set(h.Nodes(path),'Color',[1 0.4 0.4]);
edges = getedgesbynodeid(h,get(h.Nodes(path),'ID'));
set(edges,'LineColor',[1 0 0])
set(edges,'LineWidth',1.5)
For the path node 1- node10, manual output is 1-16-2-6-10 But, I got the output as 1-3-6-10.
Please help me.

Antworten (2)

Lucio Cetto
Lucio Cetto am 24 Sep. 2012
I get the distance of 1-16-2-6-10 to be 5.8, while 1-3-6-10 is 5.15. HTH

Muhammad awan
Muhammad awan am 14 Nov. 2013
I am getting the same as previous comment above, there could be some mistake in manual solution that you attempted. Because even by looking up on your network its obvious that SP is 1-3-6-10.

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