Python Add Two Matrices

Python Program to Add Two Matrices

What is Matrix?

In mathematics, matrix is a rectangular array of numbers, symbols or expressions arranged in the form of rows and columns. For example: if you take a matrix A which is a 2x3 matrix then it can be shown like this:

2       3          5
8       12        7

Image representation:

In Python, matrices can be implemented as nested list. Each element of the matrix is treated as a row. For example X = [[1, 2], [3, 4], [5, 6]] would represent a 3x2 matrix. First row can be selected as X[0] and the element in first row, first column can be selected as X[0][0].

Let's take two matrices X and Y, having the following value:

X = [[1,2,3],
    [4,5,6],
    [7,8,9]]

Y = [[10,11,12],
    [13,14,15],
    [16,17,18]]

Create a new matrix result by adding them.

See this example:

X = [[1,2,3],
       [4,5,6],
       [7,8,9]]

Y = [[10,11,12],
       [13,14,15],
       [16,17,18]]

Result = [[0,0,0],
                [0,0,0],
                [0,0,0]]
# iterate through rows
for i in range(len(X)):
   # iterate through columns
   for j in range(len(X[0])):
       result[i][j] = X[i][j] + Y[i][j]
for r in result:
   print(r)

Output: