
NumPy count_nonzero() - Count the number of non-zero elements in an array
The count_nonzero()
counts the number of non-zero elements in a NumPy array.
import numpy
a1 = numpy.array([5, 0, 9, 1])
a2 = numpy.array([[1, 0, 0, 1], [1, 1, 0, 2]])
c1 = numpy.count_nonzero(a1)
c2 = numpy.count_nonzero(a2)
print(c1) # 3
print(c2) # 5
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