Python:NumPy .sort()

The .sort() method sorts a NumPy array in-place in ascending order along a specified axis. It modifies the original array and does not return a new one.

Syntax of Numpy .sort()

ndarray.sort(axis=-1, kind=None, order=None)

Parameters:

• axis: Axis along which to sort. Default is -1 (last axis). Use None to sort the flattened array.
• kind: Sorting algorithm: 'quicksort' (default), 'mergesort', 'heapsort', or 'stable'.
• order: Only for structured arrays. Specifies the field(s) to sort by.

Example

In this example, the .sort() method is used to sort a NumPy array in descending order:

# Import NumPy
import numpy as np

# Create a NumPy array
nf = np.array(['aaa', 'xxx', 'ddd', 'sss'])

# Sort in descending order
nf.sort()     # Sorts in ascending order
nf = nf[::-1] # Reverses to get descending order

print(nf)

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The above code will result in the following output:

['xxx' 'sss' 'ddd' 'aaa']

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Codebyte Example

In the following codebyte example, a NumPy array nf is created with integers, sorted in ascending order using NumPy’s .sort() method, and then reversed to display the values in descending order:

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