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Have to update my rating. As the other user I found examples of undirected graphs where the result of the algorithm does not return a symmetric matrix. There has to be a bug somewhere!
Works great, much faster than all the other implementations I've downloaded so far (2 seconds for 1000 vertices on my laptop). Thanks
Works nice for small graphs (100 nodes), but if the graph becomes a bit larger (say, 500 nodes) it takes forever and effectively freezes my laptop...