Write a program in python to add two matrices.

**Example:**

m1 = [[1,2], [8,1]] m2 = [[1,1], [1,1]] m1+m2 = [[2,3], [9,2]]

In python, a **matrix can be represented using nested list**. For example `m1 = [[1,2],[8,1]]`

is a list having each element itself a list. Each row in a matrix can be denoted by `m1[i]`

and theelement in the ith row and jth column as `m1[i][j]`

.

So using a nested for loop we can easily add each element of the first matrix to the corresponding element of the second matrix.

**Method 1: Matrix Addition Using Nested For Loop**

*Recommended:*

#Matrix I m1 = [[1,2], [8,1]] #Matrix II m2 = [[1,1], [1,1]] #Initialize resultant matrix with 0 res = [[0,0], [0,0]] for i in range(len(m1)): for j in range(len(m1[0])): res[i][j] = m1[i][j] + m2[i][j] print(res)

**Output**

[[2, 3], [9, 2]]

In the above program we have used `len(m1)`

to find number of rows and `len(m1[0])`

to find the number of column in the metrix m1.

**Method 2: Matrix Addition using List Comprehension**

In this method instead of using nested for loop, we will use list comprehension to add matrices. I highly recommend you to read our list comprehension tutorial if you don’t know what it is?

#Matrix I m1 = [[1,2], [8,1]] #Matrix II m2 = [[1,1], [1,1]] res = [[m1[i][j] + m2[i][j] for j in range(len(m1[0]))] for i in range(len(m1))] print(res)

**Output**

[[2, 3, 2], [9, 2, 3]]

If you have any suggestions or doubts then comment below.