I have fixed the bug in igraph_density, thanks for the bug report! You can find 
the patch here:  

https://github.com/igraph/igraph/commit/d466b8d  

This will be included in the next release of igraph.

--  
T.


On Wednesday, 27 November 2013 at 21:44, Tamás Nepusz wrote:

> > After some examination, igraph's calculations for density of a graph with 
> > self-loops is counter to what I expected.
> >  
> >  
> >  
> >  
>  
> You are probably right; I think there is a bug in the undirected density 
> calculation when loops=True because the density of a graph with a single 
> vertex and a single loop edge is 2.0 according to igraph. I’ll take a look at 
> the code and try to get this fixed before the next release.
>   
> T.  
>  
>  


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