Compare two numpy arrays row-wise ValueError

Question

I want to compare two NumPy arrays row-wise and return the number of same rows.

If i use the code below:

a=np.array([[1,2],[3,4]])
b=np.         


        

Answer 1

I think that you want something akin to:

np.sum(np.all(np.equal(a, b), axis=1))

which can shorthand to the following if you prefer:

np.sum(np.all(a == b, axis=1))

---

This will return 1 for:

a = np.array([[1, 2], [3, 4]])
b = np.array([[1, 2], [5, 6]])

but 0 for:

a = np.array([[1, 2], [3, 4]])
b = np.array([[1, 3], [5, 6]])