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How to rank values in Numpy array?

Posted on March 31, 2021May 31, 2022 By Luke K

Let’s check how to rank values in a Numpy array by axis.
Numpy rank values by axis

Sometimes values do not matter so much. You may want to know the order.

Ranking with argsort

See how to rank values using the argsort Numpy function.

import numpy as np

my_array = np.array([[1, 56, 55, 15],
                     [5, 4, 33, 53],
                     [3, 6, 7, 19]])

sorted_array = np.argsort(my_array, axis=0)

print(f"These are ranks of array values: \n {sorted_array}")

Numpy rank values by axis

As you can see, there are ranks given for the values in your array. You can work on them further.

See also  How to shuffle an array in Numpy?

Ranking over another axis

Do you want to rank it differently? No problem. See:

import numpy as np

my_array = np.array([[1, 56, 55, 15],
                     [5, 4, 33, 53],
                     [3, 6, 7, 19]])

sorted_array = np.argsort(my_array, axis=1)

print(f"These are ranks of array values: \n {sorted_array}")

Numpy rank values by axis python

Now the rank is given based on another axis.

numpy Tags:array, axis, rank

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