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

NumPy Sorting and Searching: Exercise-5 with Solution

Write a NumPy program to get the indices of the sorted elements of a given array.

Sample Solution:

Python Code:

import numpy as np
student_id = np.array([1023, 5202, 6230, 1671, 1682, 5241, 4532])
print("Original array:")
print(student_id)
i = np.argsort(student_id)
print("Indices of the sorted elements of a given array:")
print(i)

Sample Output:

Original array:
[1023 5202 6230 1671 1682 5241 4532]
Indices of the sorted elements of a given array:
[0 3 4 6 1 5 2]

Pictorial Presentation:

NumPy: Get the indices of the sorted elements of a given array.

Python-Numpy Code Editor:

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Previous: Write a NumPy program to sort the student id with increasing height of the students from given students id and height. Print the integer indices that describes the sort order by multiple columns and the sorted data.
Next: Write a NumPy program to sort a given complex array using the real part first, then the imaginary part.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m