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NumPy: Reverse an array

Last update on August 29 2025 12:46:16 (UTC/GMT +8 hours)

Reverse Array

Write a NumPy program to reverse an array (the first element becomes the last).

Python NumPy: Reverse an array

Sample Solution:

Python Code:

# Importing the NumPy library with an alias 'np' import numpy as np # Creating an array 'x' using arange() function with values from 12 to 37 (inclusive) x = np.arange(12, 38) # Printing the original array 'x' containing values from 12 to 37 print("Original array:") print(x) # Reversing the elements in the array 'x' and printing the reversed array print("Reverse array:") x = x[::-1] print(x)

Sample Output:

Original array: [12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37] Reverse array: [37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12]

Explanation:

In the above code -

np.arange(12, 38): Creates a one-dimensional NumPy array with a range of integers starting from 12 (inclusive) up to, but not including, 38. The result will be an array of length 26 containing integers from 12 to 37.

x = x[::-1]: Reverses the order of the elements in the NumPy array ‘x’ by using slice notation with a step of -1. The result will be a new NumPy array with the elements in the reverse order.

For more Practice: Solve these Related Problems:

  • Reverse an array using slicing and compare the result with np.flip to ensure consistency.
  • Implement an in-place reversal of an array without using built-in reverse functions.
  • Create a function that takes an array and returns its reversed copy while preserving the original.
  • Reverse a multi-dimensional array along a specified axis and verify that only that axis is affected.

Go to:

  • NumPy Array Exercises Home ↩
  • NumPy Exercises Home ↩

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