How can I check for NaN values?

python math

Return True if x is a NaN (not a number), and False otherwise.

>>> import math>>> x = float('nan')>>> math.isnan(x)True

python math

The usual way to test for a NaN is to see if it's equal to itself:

def isNaN(num):    return num != num

python math

numpy.isnan(number) tells you if it's NaN or not.

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