[R] Finding all triangles in a graph

[Albyn Jones]

Taral

The general problem of finding subgraphs with a given structure ("motifs")
is hard (ie computationally expensive).  There is some literature...

have you looked at the package igraph, function graph.motifs()?

albyn

Quoting Taral <taralx at gmail.com>:

> I have the adjacency matrix of a graph. I'm trying to find all
> triangles (embeddings of C_3). This doesn't work:
>
> index = function(l) seq(l)[l]
> pairs = do.call(rbind, lapply(seq(nrow(adj)), function(x) cbind(x,
> index(adj[x,]))))
> triangles = do.call(rbind, apply(pairs, 1, function(x) cbind(x,
> index(adj[x[1],] & adj[x[2],]))))
>
> I'm absolutely certain I've gone down the wrong path here. O great R
> gurus, your guidance would be most welcome.
>
> --
> Taral <taralx at gmail.com>
> "Please let me know if there's any further trouble I can give you."
>     -- Unknown
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>