Hi, thanks for your report, answers are below.

On Thu, Mar 7, 2013 at 2:41 PM, Jason Cory Brunson <[email protected]> wrote:
[...]

> V(g1)$color <- rep(1:2, length = vcount(g1))
>
V(g2)$color <- rep(1:2, length = vcount(g2))
> graph.count.isomorphisms.vf2(**g1, g2)
> [1] 2
>
> It seems to me that there should be four isomorphisms: two mapping node 1
> to node 1 and two mapping node 1 to node 3.
>

This is a bug that was already fixed. I guess you are using an old igraph
version. Including your R and igraph version and platform (e.g. output of
sessionInfo()) in your bug report is a good idea. Please upgrade and try it
again.


> Any help reconciling this issue would be greatly appreciated!
>
> Also, the indices of the vertices returned by graph.get.isomorphisms are 1
> less than they should be (possibly a relic of previous versions when graphs
> begin with vertex 0?):
>

You are right, this is another bug. I'll submit a bug report for it, and
will fix it soon.

Thanks, Best Regards
G.

[...]
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