numpy sort indices - Brave Search

Get original indices of a sorted Numpy array

stackoverflow.com › questions › 7341557 › get-original-indices-of-a-sorted-numpy-array

Yes, there's the x = numpy.argsort(a) function or x = numpy.ndarray.argsort(a) method. It does exactly what you're asking for. You can also call argsort as a method on an ndarray object like so: a.argsort().

Here's a link to the documentation: http://docs.scipy.org/doc/numpy/reference/generated/numpy.argsort.html#numpy.argsort

Answer from Phillip Cloud on Stack Overflow

numpy.org › doc › 2.2 › reference › generated › numpy.argsort.html

numpy.argsort — NumPy v2.2 Manual

Perform an indirect sort along the given axis using the algorithm specified by the kind keyword. It returns an array of indices of the same shape as a that index data along the given axis in sorted order.

numpy.org › devdocs › reference › generated › numpy.argsort.html

numpy.argsort — NumPy v2.6.dev0 Manual

Perform an indirect sort along the given axis using the algorithm specified by the kind keyword. It returns an array of indices of the same shape as a that index data along the given axis in sorted order.

Videos

numpy sort index

NumPy argsort() Tutorial: Master Indirect Sorting in Python | Get ...

October 30, 2025

NumPy Argsort vs Sort - YouTube

Sort, Argsort in NumPy Python | Module NumPy Tutorial - Part 17 ...

September 26, 2022

Sort Numpy Arrays by Row and Column with numpy.argsort - YouTube

Python NumPy | Argsort - YouTube

geeksforgeeks.org › python › numpy-argsort-in-python

numpy.argsort() in Python - GeeksforGeeks

July 11, 2025 - numpy.argsort() is a function in NumPy that returns the indices that would sort an array. In other words, it gives you the indices that you would use to reorder the elements in an array to be in sorted order.

numpy.org › doc › stable › reference › generated › numpy.argsort.html

numpy.argsort — NumPy v2.5 Manual

Returns the indices that would sort an array.

docs.vultr.com › python › third party › numpy › argsort()

Python Numpy argsort() - Sort Array Indices

November 11, 2024 - This code snippet sorts the data array and returns the indices that sort the array.

programiz.com › python-programming › numpy › methods › argsort

NumPy argsort()

The argsort() method in NumPy sorts the array elements in ascending order and returns indices of the sorted elements. The argsort() method in NumPy sorts the array elements in ascending order and returns indices of the sorted elements.

numpy.org › doc › 2.2 › reference › generated › numpy.searchsorted.html

numpy.searchsorted — NumPy v2.2 Manual

Find the indices into a sorted array a such that, if the corresponding elements in v were inserted before the indices, the order of a would be preserved.

codingnomads.com › numpy-sort

NumPy Sort: How to Sort a NumPy Array

Use the NumPy argsort command - np.argsort() - to return indices that would sort the array.

Find elsewhere

Google Bing Mojeek

geeksforgeeks.org › python › how-to-get-the-indices-of-the-sorted-array-using-numpy-in-python

How to Get the Indices of the Sorted Array using NumPy in Python - GeeksforGeeks

September 27, 2025 - The numpy.argsort() function is used to get indices that would sort a NumPy array. Instead of returning sorted array, it returns positions of the elements in order that sorts the array.

stackoverflow.com › questions › 7341557 › get-original-indices-of-a-sorted-numpy-array

python - Get original indices of a sorted Numpy array - Stack Overflow

Yes, there's the x = numpy.argsort(a) function or x = numpy.ndarray.argsort(a) method. It does exactly what you're asking for. You can also call argsort as a method on an ndarray object like so: a.argsort().

Here's a link to the documentation: http://docs.scipy.org/doc/numpy/reference/generated/numpy.argsort.html#numpy.argsort

Here's an example, for reference and convenience:

# create an array
a = np.array([5,2,3])

# np.sort - returns the array, sorted
np.sort(a)
>>> array([2, 3, 5])

# argsort - returns the original indexes of the sorted array
np.argsort(a)
>>> array([1, 2, 0])

numpy.org › doc › stable › reference › generated › numpy.searchsorted.html

numpy.searchsorted — NumPy v2.5 Manual

Find the indices into a sorted array a such that, if the corresponding elements in v were inserted before the indices, the order of a would be preserved.

codecademy.com › article › sorting-and-unary-operations-in-num-py

Sorting and Unary Operations in NumPy | Codecademy

... This method is efficient for ... copies of the data. The numpy.argsort() function returns the indices of the elements in an array that would sort the array in ascending order....

numpy.org › devdocs › reference › generated › numpy.searchsorted.html

numpy.searchsorted — NumPy v2.6.dev0 Manual

Find the indices into a sorted array a such that, if the corresponding elements in v were inserted before the indices, the order of a would be preserved.

w3resource.com › python-exercises › numpy › python-numpy-sorting-and-searching-exercise-5.php

NumPy: Get the indices of the sorted elements of a given array - w3resource

August 30, 2025 - Generate the indices that would sort a 1D array using np.argsort and return both the sorted array and the indices.

numpy.org › doc › 2.1 › reference › generated › numpy.argsort.html

numpy.argsort — NumPy v2.1 Manual

Returns the indices that would sort an array.

stackoverflow.com › questions › 55381356 › numpy-efficient-way-to-sort-array-and-find-corresponding-indices

python - Numpy: Efficient way to sort array and find corresponding indices - Stack Overflow

You don't need to sort twice. If you need the indices that sort the array, you'll need np.argsort, but in order to sort the values in arr you only need to index with the result from np.argsort:

s = np.argsort(arr)
# array([1, 0, 2])
arr[s]
# array([1, 2, 3])

Yes, you can use argsort to get the sorted array.

import numpy as np
arr = np.array([2,1,3])
sorted_indices = np.argsort(arr)
sorted_arr = arr[sorted_indices]

numpy.org › doc › 2.0 › reference › generated › numpy.argsort.html

numpy.argsort — NumPy v2.0 Manual

Returns the indices that would sort an array.

JAX Documentation

docs.jax.dev › en › latest › _autosummary › jax.numpy.argsort.html

jax.numpy.argsort — JAX documentation

jax.numpy.argsort(a, axis=-1, *, kind=None, order=None, stable=True, descending=False, dtype=None)[source]# Return indices that sort an array.

numpy.org › doc › 1.25 › reference › generated › numpy.argsort.html

numpy.argsort — NumPy v1.25 Manual

Array of indices that sort a along the specified axis. If a is one-dimensional, a[index_array] yields a sorted a.

docs.scipy.org › doc › numpy-1.15.1 › reference › generated › numpy.argsort.html

numpy.argsort — NumPy v1.15 Manual

Returns the indices that would sort an array.