Creating a digraph model using Simulink

How can I take a mathematically weighted digraph model and create the model using Simulink?

For those who don't know the process, I have a bunch of vertices and they are connected to other vertices via weighted arcs. Its best explained here: http://en.wikipedia.org/wiki/Directed_graph

The arrows (arc) are given a weight depending on the intensity it effects the adjacent vertex. These weights are then placed into a matrix and are used for sensitivity testing.

I was wondering how to create a model like this using Simulink so that I can run some simulations and see if I changed weights of arcs within the model how the output would be affected.

Any Simulink expects have any ideas? Thanks, Ash