Python Program For Matrix Multiplication By Getting Input From User

In this tutorial, you will learn about the python program for matrix multiplication by getting input from user.

Matrix multiplication is an essential operation in linear algebra, and Python provides a convenient way to perform this operation.

In this article, we will learn how to write a Python program that multiplies matrices based on user input.

By following the steps outlined here, you will be able to create a program that can handle matrix multiplication for various sizes of matrices, enhancing your understanding of both Python programming and linear algebra.

Here is a Python program that performs matrix multiplication based on user input.

Python Program For Matrix Multiplication By Getting Input From User

# Get the dimensions of the matrices
rows1 = int(input("Enter the number of rows for the first matrix: "))
cols1 = int(input("Enter the number of columns for the first matrix: "))
rows2 = int(input("Enter the number of rows for the second matrix: "))
cols2 = int(input("Enter the number of columns for the second matrix: "))

# Check if matrix multiplication is possible
if cols1 != rows2:
    print("Matrix multiplication is not possible!")
else:
    # Initialize matrices
    matrix1 = []
    matrix2 = []

    # Get elements for the first matrix
    print("Enter elements for the first matrix:")
    for i in range(rows1):
        row = []
        for j in range(cols1):
            row.append(int(input("Enter element: ")))
        matrix1.append(row)

    # Get elements for the second matrix
    print("Enter elements for the second matrix:")
    for i in range(rows2):
        row = []
        for j in range(cols2):
            row.append(int(input("Enter element: ")))
        matrix2.append(row)

    # Perform matrix multiplication
    result = [[0 for _ in range(cols2)] for _ in range(rows1)]
    for i in range(rows1):
        for j in range(cols2):
            for k in range(cols1):
                result[i][j] += matrix1[i][k] * matrix2[k][j]

    # Display the result
    print("Resultant matrix after multiplication:")
    for row in result:
        print(row)

You can run this code on our free Online Python Compiler.

Output

The above program prompts the user to enter the dimensions and elements of two matrices.

It then performs matrix multiplication and displays the resultant matrix.

Let’s break down the steps of the program to understand how it works:

Getting the dimensions of the matrices

The program prompts the user to enter the number of rows and columns for both matrices.

This step ensures that the matrices have compatible dimensions for multiplication.

Checking if multiplication is possible

The program checks if the number of columns in the first matrix is equal to the number of rows in the second matrix.

If not, it displays a message indicating that matrix multiplication is not possible.

Initializing matrices: Python Program For Matrix Multiplication By Getting Input From User

Two empty matrices, matrix1 and matrix2, are initialized.

Getting elements for the matrices

The program prompts the user to enter the elements for each matrix.

It uses nested loops to iterate over the rows and columns of each matrix and stores the entered values in the respective matrices.

Performing matrix multiplication

The program initializes an empty matrix called result, which will store the result of matrix multiplication.

It uses nested loops to iterate over the rows and columns of the matrices and calculates the dot product for each element of the result matrix.

Displaying the result: Python Program For Matrix Multiplication By Getting Input From User

Finally, the program displays the resultant matrix after multiplication.

Can I multiply matrices of any size using this program?

Yes, you can multiply matrices of any size as long as the number of columns in the first matrix is equal to the number of rows in the second matrix.

The program checks this condition before performing multiplication.

What happens if I enter invalid dimensions for matrix multiplication?

If you enter invalid dimensions, such as incompatible numbers of rows and columns, the program will display a message stating that matrix multiplication is not possible.

You will need to provide valid dimensions for matrix multiplication.

Can I use decimal or floating-point numbers in the matrices?

Yes, you can use decimal or floating-point numbers in the matrices.

The program prompts for element input using the input() function, which allows you to enter any numerical value.

Can I modify the program to perform matrix addition or subtraction?

Yes, you can modify the program to perform matrix addition or subtraction by changing the respective operation in the innermost loop where the program calculates the dot product.

Instead of multiplying the corresponding elements, you can add or subtract them based on your requirement.

How do you multiply a matrix with user input in Python?

To multiply matrices with user input in Python, you can follow these steps:

1. Prompt the user to enter the dimensions (rows and columns) of the matrices.
2. Check if the dimensions are compatible for multiplication.
3. Prompt the user to enter the elements of the matrices.
4. Multiply the matrices element-wise and store the result in a new matrix.
5. Display the resultant matrix.

How to add two matrices in Python by taking input from the user?

To add two matrices in Python by taking input from the user, you can use the following approach:

1. Prompt the user to enter the dimensions (rows and columns) of the matrices.
2. Check if the dimensions of both matrices are the same.
3. Prompt the user to enter the elements of both matrices.
4. Add the corresponding elements of the matrices and store the result in a new matrix.
5. Display the resultant matrix.

How do you solve a matrix multiplication in Python?

To solve matrix multiplication in Python, you can use the following steps:

1. Define two matrices.
2. Use the numpy.dot() function to perform the matrix multiplication.
3. Store the result in a new matrix.
4. Display the resultant matrix.

Here’s an example.

Python Program For Matrix Multiplication By Getting Input From User

import numpy as np

# Define the matrices
matrix1 = np.array([[1, 2], [3, 4]])
matrix2 = np.array([[5, 6], [7, 8]])

# Perform matrix multiplication
result = np.dot(matrix1, matrix2)

# Display the result
print(result)

You can run this code on our free Online Python Compiler.

Output

In this article, we have learned how to write a Python program that performs matrix multiplication based on user input.

By following the program and the steps outlined here, you can create a flexible and interactive tool for multiplying matrices of various sizes.

Matrix multiplication is a fundamental operation in linear algebra, and mastering it in Python will enhance your computational skills and understanding of matrices.

Now it’s time to put your knowledge into practice and start multiplying matrices using Python!

Happy coding!