np.argsort()

The `numpy.argsort()` function returns an array of indices that would sort an input array in ascending order.

Syntax:

`numpy.argsort(a, axis=-1, kind=None, order=None)`

Parameters:

- `a`: Input array to be sorted.
- `axis`: Axis along which to sort. If None, the array is flattened before sorting. Default is -1.
- `kind`: Sorting algorithm. Default is 'quicksort'.
- `order`: If `a` is structured array, the field to use for sorting. Default is None.

Returns:

- An array of indices that would sort the input array in ascending order.

Example:

import numpy as np

arr = np.array([9, 3, 7, 1, 2, 6, 8, 5, 4])

sorted_indices = np.argsort(arr)

print(sorted_indices)

Output:

[3 4 1 8 7 5 2 6 0]