Python Exercise Example 44 - Adding Two Matrices in Python

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Two 3x3 matrices. Add the data at corresponding positions and return a new matrix:

X = [[12,7,3],
    [4 ,5,6],
    [7 ,8,9]]

Y = [[5,8,1],
    [6,7,3],
    [4,5,9]]

Program analysis: Create a new 3x3 matrix, use a for loop to iterate and take out the values at corresponding positions in matrices X and Y, add them, and place them into the corresponding positions of the new matrix.

Program source code:

Source Code:

#!/usr/bin/python # -*- coding: UTF-8 -*- X = [[12,7,3], [4 ,5,6], [7 ,8,9]] Y = [[5,8,1], [6,7,3], [4,5,9]] result = [[0,0,0], [0,0,0], [0,0,0]] # Iterate over rows for i in range(len(X)): # Iterate over columns for j in range(len(X[0])): result[i][j] = X[i][j] + Y[i][j] for r in result: print(r)

Executing the above code, the output is as follows:

[17, 15, 4]
[10, 12, 9]
[11, 13, 18]

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