Count all values in a matrix greater than a value

Question

I have to count all the values in a matrix (2-d array) that are greater than 200.

The code I wrote down for this is:

za=0   
p31 = numpy.asarray(o31)         


        

Answer 1

This is very straightforward with boolean arrays:

p31 = numpy.asarray(o31)
za = (p31 < 200).sum() # p31<200 is a boolean array, so `sum` counts the number of True elements