***Update:*** I am no longer maintaining IGraphR. I recommend that you transition to [IGraph/M](http://szhorvat.net/mathematica/IGraphM) instead. If you need a feature that IGraph/M does not yet have, please submit a [feature request][1].

----

I wrote a small package for this. The main reason why I'm posting it here is to get some feedback on how to improve it. I'm new both R and RLink.

You can get the package [here][2]. Please see the installation instructions in README.md, especially if you're a Mac user (*important!*).

###How does it work?

[RLink does not play well with igraph objects][3], so an edge-list representation is used to transfer data between R and Mathematica. Using a simple edge-list is good for performance and transparency too. On the R side, edge lists are marked with the `mmaDirectedGraph` attribtue. On the Mathematica side, `Graph` objects are auto-converted to R edge lists using RLink's `RDataTypeRegister` mechanism.

The function to be called and the argument list are passed separately to R. On the R side a function takes care of converting the egde lists to proper igraph objects, and then calls the function. If the return value is a graph, it also converts that back to an edge list.

###Usage examples

Mac users will need to load RLink like this first (again, follow [the instructions on github][2]!!):

 << RLink`
 
 SetEnvironment[
 "DYLD_LIBRARY_PATH" -> 
 "/Library/Frameworks/R.Framework/Resources/lib"];
 
 InstallR["RHomeLocation" -> 
 "/Library/Frameworks/R.Framework/Resources"]

Note: if using Mathematica 10.0.1, also specify the R version, e.g.

 InstallR["RHomeLocation" -> 
 "/Library/Frameworks/R.Framework/Resources", "RVersion" -> "3.1"]

Examples:

 IGraph["vertex.connectivity"][CycleGraph[5]]

 (* ==> {2.} *)

 IGraph["barabasi.game"][50]

![enter image description here][4]


 [1]: https://github.com/szhorvat/IGraphM/issues
 [2]: https://github.com/szhorvat/IGraphR
 [3]: https://mathematica.stackexchange.com/questions/22942/using-non-trivial-objects-in-rlink
 [4]: https://i.sstatic.net/b4bUI.png