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.
If you are beginning your Python coding journey, then check out these best books to learn Python.
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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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Hello Friends! I am Himanshu, a hobbyist programmer, tech enthusiast, and digital content creator.
With CodeItBro, my mission is to promote coding and help people from non-tech backgrounds to learn this modern-age skill!