2D histogram search algorithm

I am writing a python program that will systematically search through bins of a 2D histogram and detect abnormally high or low bin counts.

Does anyone have ideas on where to start, or references to point me to?

It depends from how far you start :slight_smile:

Let says that a loop on all bins, calling GetBinContent for each of them, will allow to retrieve the bin value. Then you apply you your criteria on this values to detect abnormally high or low bin counts.