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implementation of djikstras, need to find the logic to print the path and its implementation

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I have here implemented the dijkstras on a sample graph ..... but im not getting the logic how to store the path and print the shortest path through the nodes.. need help
i will share the codes here.
function [path] = myShortestpath(G, s, t)
nodes = [3, -2; ...
3, -1; ...
3, 1; ...
13, -1; ...
12, -1; ...
1,-1; ...
1, 1; ...
14,-1; ...
11,-1; ...
2, -1; ...
2, 1; ...
];
G = [1, 2, 1.0; ...
2, 1, 1.0; ...
3, 4, 4.0; ...
4, 6, 4.5; ...
6, 5, 3.0; ...
5, 3, 3.5; ...
6, 9, 5.0; ...
9, 10, 4.0; ...
10, 8, 5.0; ...
8, 6, 4.0; ...
];
s=3;
t=8;
nodeNames = cell.empty;
num_nodes = size(nodes, 1);
for iN = 1:num_nodes
curName = sprintf('(%i|%i)', nodes(iN, 1), nodes(iN, 2));
nodeNames = [nodeNames, curName]; %#ok<AGROW>
end
% Convert graph to digraph object
dg = digraph(G(:, 1), G(:,2), G(:,3), nodeNames);
plot (dg);
%num_vertices= size(G,1);
visited_vertices(1:num_nodes) = false;
distance(1:num_nodes) = inf;
distance(s)=0;
%weights= G(:,3);
weightMatrix = zeros(num_nodes, num_nodes);
weightMatrix(sub2ind(size(weightMatrix), G(:,1), G(:,2))) = G(:,3);
%exch_init_distance = 1;
previous=[];
for v = 1:num_nodes-1
vertex_minimum = minimum_vertex(distance, visited_vertices, num_nodes);
visited_vertices(vertex_minimum) = true;
for toNode = 1: num_nodes
if (weightMatrix(vertex_minimum,toNode)~= 0 && ~(visited_vertices(toNode)))
temp_distance = distance(vertex_minimum) + weightMatrix(vertex_minimum,toNode);
if (temp_distance < distance(toNode))
distance(toNode) = temp_distance;
previous(toNode) = vertex_minimum;
%exch_init_distance = distance(toNode);
end
end
end
end
end
  2 comentarios
Akira Agata
Akira Agata el 23 de Sept. de 2019
To store the shortest path and print it, MATLAB function shortestpath and its help page will be help.
Or, would you like to implement Dijkstra algorithm by yourself?
Alan Antony
Alan Antony el 24 de Sept. de 2019
i had got it implemented , but thanks for the reply..... will post more if i have more doubts

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