numpy - Sort array's rows by another array in Python

Question

I'm trying to sort the rows of one array by the values of another. For example:

import numpy as np
arr1 = np.random.normal(1, 1, 80)
arr2 = np.random.normal(1,1, (80,100))

I want to sort arr1 in descending order, and to have the current relationship between arr1 and arr2 to be maintained (ie, after sorting both, the rows of arr1[0] and arr2[0, :] are the same).

Answer 1

Use argsort as follows:

arr1inds = arr1.argsort()
sorted_arr1 = arr1[arr1inds[::-1]]
sorted_arr2 = arr2[arr1inds[::-1]]

This example sorts in descending order.