NumPy: Create a 8x8 matrix and fill it with a checkerboard pattern
8x8 Checkerboard Pattern
Write a NumPy program to create an 8x8 matrix and fill it with a checkerboard pattern.
Sample Solution:
Python Code:
# Importing the NumPy library with an alias 'np'
import numpy as np
# Creating a 3x3 NumPy array filled with ones
x = np.ones((3, 3))
# Printing a message indicating the checkerboard pattern
print("Checkerboard pattern:")
# Creating an 8x8 NumPy array filled with zeros and setting alternate elements to 1 to create a checkerboard pattern
x = np.zeros((8, 8), dtype=int)
x[1::2, ::2] = 1 # Setting alternate rows starting from the second row with alternate columns to 1
x[::2, 1::2] = 1 # Setting alternate rows starting from the first row with alternate columns to 1
# Printing the resulting checkerboard pattern array
print(x)
Sample Output:
Checkerboard pattern: [[0 1 0 1 0 1 0 1] [1 0 1 0 1 0 1 0] [0 1 0 1 0 1 0 1] [1 0 1 0 1 0 1 0] [0 1 0 1 0 1 0 1] [1 0 1 0 1 0 1 0] [0 1 0 1 0 1 0 1] [1 0 1 0 1 0 1 0]]
Explanation:
In the above code –
x = np.ones((3,3)): Creates a 3x3 NumPy array filled with ones. However, this line is not relevant to the final output and can be ignored.
x = np.zeros((8,8),dtype=int): Creates an 8x8 NumPy array filled with zeros, with an integer data type.
x[1::2,::2] = 1: Assigns the value 1 to every other element in every other row, starting from the second row (index 1).
x[::2,1::2] = 1: Assigns the value 1 to every other element in every other column, starting from the second column (index 1).
print(x): Prints the 8x8 NumPy array.
Python-Numpy Code Editor: