Creation of 2D array and print the diagonal elements of the matrix in Python

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              2D array has rows and columns. The data is stored in row wise. Let us create a 2D array as follows.

Python code to create a 2D array of elements:

#import the built-in file numpy and develop an object np1

import numpy as np1

# Create a 2D array of elements with 2 rows and 2 columns

arr_2d = np1.arange(1, 5).reshape(2, 2)

#print the elements

print("2D Array elements are:\n", arr_2d)

here, is the output.

2D Array elements are:

 [[1 2]

 [3 4]]

If you want to change the rows and columns to 3. Use the below code…

arr_2d = np1.arange(1, 10).reshape(3, 3)

It gives you the output as follows.

2D Array elements are:

 [[1 2 3]

 [4 5 6]

 [7 8 9]]

If you want to print 4 rows and columns. Let this code helps…

arr_2d = np1.arange(1, 17).reshape(4, 4)

The output is  

2D Array elements are:

 [[ 1  2  3  4]

 [ 5  6  7  8]

 [ 9 10 11 12]

 [13 14 15 16]]

Next program is to print the diagonal elements of a matrix.

Python program to print the diagonal elements of a matrix:

            This program starts from creating a 3X3 matrix with elements. Next, print the diagonal elements by using len() function. If you want to print the secondary diagonal number, use the same function subtracted by 1.

Matrix1 = [

    [11, 22, 33],

    [44, 55, 66],

    [76, 87, 69]

]

# Print main diagonal elements

print("Main diagonal elements:")

for i in range(len(matrix)):

    print(matrix[i][i])

 # Print secondary diagonal elements

print("Secondary diagonal elements:")

for i in range(len(matrix)):

    print(matrix[i][len(matrix) - 1 - i])

Output:

Main diagonal elements:

11

55

69

Secondary diagonal elements:

33

55

76

That’s all. Thus the python program to create 2D array and print the diagonal elements of the matrix was done successfully. Keep Coding!!!!

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