Python 3 Program To Multiply Two Matrices

Here you will learn a simple Python 3 program to multiply two matrices. Before moving ahead, make sure that you have a basic understanding of Python programming concepts such as if-else statements, for loops, lists, dictionaries, etc.

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Python 3 Program To Multiply Two Matrices

Here is the flow of our Python program.

Step 1: Take input of the number of rows and columns for Matrix A and B.

Step 2: If columns of Matrix A is not equal to rows of matrix B, then the multiplication can’t be done, and the user will see the error message.

Step 3: If columns of matrix A = rows of matrix B, then user’s will be prompted to enter the elements of both the matrices one by one.

Step 4: After the user has specified all the elements, they will see matrix A, matrix B, and the multiplication result.

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Now, take a look at the source code and see how all those steps mentioned above are executed.

Source Code

r1 = int(input("Enter number of row for Matrix A :"))
c1 = int(input("Enter number of column for Matrix A :"))
r2 = int(input("Enter number of row for Matrix B :"))
c2 = int(input("Enter number of column for Matrix B :"))

if c1 != r2:
   print("\nCan't Multiply --> To Multiply two matrix (A x B) ,Column of Matrix A = Row of Matrix B")
else:
   print("Enter element row wise for matrix A :")
   A = []
   for i in range(r1):
       arrA = []
       for j in range(c1):
           arrA.append(int(input()))
       A.append(arrA)

   print("Enter element row wise for matrix B :")
   B = []
   for i in range(r2):
       arrB = []
       for j in range(c2):
           arrB.append(int(input()))
       B.append(arrB)

   print("Matrix A=")
   for w in A:
       print(w)
   print("matrix B=")
   for x in B:
       print(x)
   result = []
   for i in range(r1):
       arrR = []
       for j in range(c2):
           arrR.append(0)
       result.append(arrR)
   for i in range(len(A)):
       for j in range(len(B[0])):
           for k in range(len(B)):
               result[i][j] = A[i][k] * B[k][j] + result[i][j]

   print("AXB=")
   for y in result:
       print(y)

Program output:

Enter number of row for Matrix A :2
Enter number of column for Matrix A :2
Enter number of row for Matrix B :2
Enter number of column for Matrix B :2
Enter element row wise for matrix A :
2
2
2
2
Enter element row wise for matrix B :
2
2
2
2
Matrix A=
[2, 2]
[2, 2]
matrix B=
[2, 2]
[2, 2]
AXB=
[8, 8]
[8, 8]

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