I've got a problem. I need to create network graph where avatars are nodes (different sizes). Similar to this one:
Furthermore on this image every avatar has the same size, what I need to do is different size of avatar depending on a chosen statistic (e.g. in-degree). I cannot find any tutorial in R, which explains how to do that.
Best Answer
I would suggest taking a look at NetworkX in Python, to add to the tremendous list of recommendations you're getting. I've found it to be quite flexible. It expressly allows things like images to be nodes:
This thread on their message list suggests people have been thinking about problems similar to yours, and I've found their community quite helpful.
If nothing else, NetworkX can absolutely calculate almost any graph measure you could care to think about, and lay out the graph for you using "avatar sized squares" which you could use to bring in the actual images.