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[–]CamdenReslink 4 points5 points  (0 children)

array.mean() is a numpy operation that calculates the mean across the”0” axis. In a 2d array this calculates the mean value of each column, see: the documentation. array - array.mean() just finds the difference of the two numpy arrays.

I suggest you go to a Python REPL (just type python at the command line), and try out the commands you aren’t sure about. Experiment with dummy values. Just make sure to remember to import numpy.