NumPy: Get the minimum and maximum value of a given array along the second axis

Last update on April 29 2025 13:01:21 (UTC/GMT +8 hours)

2. Minimum and Maximum Along Second Axis

Write a NumPy program to get the minimum and maximum value of a given array along the second axis.

Sample Solution:

Python Code:

# Importing the NumPy library
import numpy as np

# Creating a 2x2 array 'x' using arange and reshape
x = np.arange(4).reshape((2, 2))

# Displaying the original array 'x'
print("\nOriginal array:")
print(x)

# Finding and displaying the maximum value along the second axis (axis=1) using np.amax()
print("\nMaximum value along the second axis:")
print(np.amax(x, 1))

# Finding and displaying the minimum value along the second axis (axis=1) using np.amin()
print("Minimum value along the second axis:")
print(np.amin(x, 1))

Sample Output:

Original array:
[[0 1]
 [2 3]]

Maximum value along the second axis:
[1 3]
Minimum value along the second axis:
[0 2]

Explanation:

In the above code –

x = np.arange(4).reshape((2,2)): This line creates a 2D array of shape (2, 2) using the np.arange function and then reshape it to the desired shape using the reshape method.

np.amax(x, 1): Here np.amax(x, 1) returns the maximum value along the 1st axis (rows) of x which is a 2x2 array. This returns a 1D array with 2 elements where each element is the maximum value of its corresponding row in the original x array. np.amin(x, 1): Here

np.amin(x, 1) returns the minimum value along the 1st axis (rows) of x which is a 2x2 array. This returns a 1D array with 2 elements where each element is the minimum value of its corresponding row in the original x array.

For more Practice: Solve these Related Problems:

Write a function that computes the minimum and maximum for each row (axis 1) of a 2D array using np.amin and np.amax.
Create a program that returns the indices of the minimum and maximum elements along the second axis of a given matrix.
Implement a solution that computes the min and max along axis 1 and then concatenates the results into a single 2D array.
Develop a method that verifies the min and max along the second axis by comparing the output with a loop-based approach.

Go to:

Previous: Write a Python program to find the maximum and minimum value of a given flattened array.
Next: Write a NumPy program to calculate the difference between the maximum and the minimum values of a given array along the second axis.

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