Multiply Matrices in Python from User Inputs

Python Scripts

r1 = int(input("Enter the no. of rows of first matrix : "))  
c1 = int(input("Enter the no. of columns of first matrix : "))  
r2 = int(input("Enter the no. of rows of second matrix : "))    
c2 = int(input("Enter the no. of columns of second matrix : "))

#initialize the two matrices
matrix1 = [[0] * c1 for i in range(r1)] # 0 matrix of size (r1,c1)
matrix2 = [[0] * c2 for i in range(r2)]

#enter the elements of the first matrix
print("Enter the elements of the first matrix (separated by line):")
for i in range(r1):
    for j in range(c1):
        matrix1[i][j] = int(input())

#enter the elements of the second matrix
print("Enter the elements of the second matrix (separated by line):")
for i in range(r2):
    for j in range(c2):
        matrix2[i][j] = int(input())

#initialize the result matrix
result = [[0] * c2 for i in range(r1)]

#multiply the two matrices
for i in range(r1):
    for j in range(c2):
        for k in range(c1):
            result[i][j] += matrix1[i][k] * matrix2[k][j]

#print the result matrix
print("Result:")
for i in range(r1):
    for j in range(c2):
        print(result[i][j], end=" ")
    print()

Output

Enter the no. of rows of first matrix : 3

Enter the no. of columns of first matrix : 3

Enter the no. of rows of second matrix : 3

Enter the no. of columns of second matrix : 3

Enter the elements of the first matrix (separated by line):

Enter the elements of the second matrix (separated by line):

Result:

30 36 42

66 81 96

102 126 150

...Program finished with exit code 0

Press ENTER to exit console.

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