Fix Python – Find the most frequent number in a NumPy array


Asked By – JustInTime

Suppose I have the following NumPy array:

a = np.array([1,2,3,1,2,1,1,1,3,2,2,1])

How can I find the most frequent number in this array?

Now we will see solution for issue: Find the most frequent number in a NumPy array


If your list contains all non-negative ints, you should take a look at numpy.bincounts:

and then probably use np.argmax:

a = np.array([1,2,3,1,2,1,1,1,3,2,2,1])
counts = np.bincount(a)

For a more complicated list (that perhaps contains negative numbers or non-integer values), you can use np.histogram in a similar way. Alternatively, if you just want to work in python without using numpy, collections.Counter is a good way of handling this sort of data.

from collections import Counter
a = [1,2,3,1,2,1,1,1,3,2,2,1]
b = Counter(a)

This question is answered By – JoshAdel

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