Re: [igraph] Union of two graphs keeping attributes

[Matteo Fortini]

My bad. I edited the solution on SO (per their policy) instead of 
showing the before/after solutions, so the current one is not so bad 
even in Python (the previous one was much slower).

Is it possible to insert into next igraph? Should I go ahead and send a 
pull request on github?

How would you call it? An option on Graph.compose()? It's not a real 
union, it's more the reverse of a decompose() operation.

Thank you,
Matteo

Il 05/06/2013 22:12, Tamás Nepusz ha scritto:
> Hi,
>
> > regarding a question which was asked before in this ML by Gábor Tóth,
> > you can find my solution here, which works, but is still too slow for
> > me:
> >
> > http://stackoverflow.com/questions/16928593/igraph-python-union-preserving-attributes
> >
> > Hope someone can find a way to speed it up.
> This is probably as good as it gets using pure Python. Have you tried to 
> measure which part is the slowest in your case? Is it the addition of edges, or 
> the part where the vertex/edge attributes are copied?