Using accumarray to sum all values associated with a given node
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Given a graph with the following edges
edges = [1 2; 2 3; 3 1; 2 4; 4 5; 4 1];
I have some data associated with each edge
data=[0.276
0.679
0.655
0.162
0.118
0.333];
For a given node, I want to sum the data values corresponding to all edges it's connected to. How do I do this? accumarray looks promising, but this gives six nonzero values, when there should just be 5 (and I don't know how to distinguish which one corresponds to which node).
sum_data = accumarray(edges,data);
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edges = [1 2; 2 3; 3 1; 2 4; 4 5; 4 1];
data=[0.276
0.679
0.655
0.162
0.118
0.333];
m=max(edges(:));
A=accumarray(edges,data,[m,m],[],0,1);
out=sum(A+A.',2) %assume it's a non-directed graph
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