Branching - the scientific way

When a a biophysicist model a pattern in nature, and that includes the branching of plants, it is most often done by estimation a system of diferential equations. Like the Gierer-Meinhardt model system which models an activator-inhibitor process. The graph illustrates my modest first try out in the estimation of such a model. Incidentally I used SAS, to estimate the model, well now I have added PROC IML to my SAS knowledge.