check how many elements are equal in two numpy arrays python

Question

I have two numpy arrays with number (Same length), and I want to count how many elements are equal between those two array (equal = same value and position in array)

A = [1, 2, 3, 4]
B = [1, 2, 4, 3]

then I want the return value to be 2 (just 1&2 are equal in position and value)

Asked By: Shai Zarzewski

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Source

Answer 1

Using numpy.sum:

>>> import numpy as np
>>> a = np.array([1, 2, 3, 4])
>>> b = np.array([1, 2, 4, 3])
>>> np.sum(a == b)
2
>>> (a == b).sum()
2

Answered By: falsetru

Answer 2

As long as both arrays are guaranteed to have the same length, you can do it with:

np.count_nonzero(A==B)

Answered By: jdehesa

check how many elements are equal in two numpy arrays python

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