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# Python program to add two matrices

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Purpose: to program the calculation of the sum of two matrices, and then print it out in Python.
Examples:

` Input: X = [[1,2,3], [4, 5,6], [7, 8,9]] Y = [[9,8, 7], [6,5,4], [3,2,1]] Output: result = [[10,10,10], [10,10,10], [10,10,10]] `

We can add a matrix in Python in the following ways.

1. Using for loop :

 ` # Program for adding two matrices using a nested loop `   ` X ` ` = ` ` [[` ` 1 ` `, ` ` 2 ` `, ` ` 3 ` `], ` ` [` ` 4 ` `, ` ` 5 ` `, ` ` 6 ` `], ` ` [` ` 7 ` `, ` ` 8 ` `, ` ` 9 ` `]] ` ` `  ` Y ` ` = ` ` [[[` ` 9 ` `, ` ` 8 ` `, ` ` 7 ` `], ` ` [` ` 6 ` `, ` ` 5 ` `, ` ` 4 ` `], ` ` [` ` 3 ` `, ` ` 2 ` `, ` ` 1 ` `]] `     ` result ` ` = ` ` [[` ` 0 ` `, ` ` 0 ` `, ` ` 0 ` `], ` ` [` ` 0 ` `, ` ` 0 ` `, ` ` 0 ` `], ` ` [` ` 0 ` `, ` ` 0 ` `, ` ` 0 ` `]] `   ` # iterate over lines ` ` 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) `

Output:

` [10, 10, 10] [10, 10, 10] [10, 10, 10] `

Explanation: —
In this program, we used nested for loops to iterate over every row and every column. At each point, we add the corresponding elements to two matrices and store them as a result.

2. Usage understanding a nested

` # Program for adding two matrices `
` # using comprehension list `

` X ` ` = ` ` [[` ` 1 ` `, ` ` 2 ` `, ` ` 3 ` `], `

` [` ` 4 ` `, ` ` 5 ` `, ` ` 6 ` `], `

` [` ` 7 ` `, ` ` 8 ` `, ` ` 9 ` `]] `

` Y ` ` = ` ` [[` ` 9 ` `, ` ` 8 ` `, ` ` 7 ` `], `

` [` ` 6 ` `, ` ` 5 ` `, ` ` 4 ` `], `

` [` ` 3 ` `, ` ` 2 ` `, ` ` 1 ` `]] `

` result ` ` = ` ` [[X [i] [j] ` ` + ` ` Y [i] [j] ` ` for ` ` j ` ` in ` ` range `

` (` ` len ` ` (X [` ` 0 ` `]))] ` ` for ` ` i ` ` in ` ` range ` ` (` ` len ` ` (X))] `

` `

` for ` ` r ` ` in ` ` result: `

` print ` ` (r) `

Output:

` [ 10, 10, 10] [10, 10, 10] [10, 10, 10] `

Explanation: —
The output of this program is the same, as stated above. We used nested list comprehension to iterate over each element in the matrix. Understanding lists allows us to write concise codes, and we should try to use them often in Python. They are very useful.

3. Using

` # Program for adding two matrices `
` # using zip () `

` X ` ` = ` ` [[` ` 1 ` `, ` ` 2 ` `, ` ` 3 ` `], `

` [` ` 4 ` `, ` ` 5 ` `, ` ` 6 ` `], `

` [` ` 7 ` `, ` ` 8 ` `, ` ` 9 ` `]] `

` Y ` ` = ` ` [[` ` 9 ` `, ` ` 8 ` `, ` ` 7 ` `], `

` [` ` 6 ` `, ` ` 5 ` `, ` ` 4 ` `], `

` [` ` 3 ` `, ` ` 2 ` `, ` ` 1 ` `]] `

< p>

` result ` ` = ` ` [` ` map ` ` (` ` sum ` `, ` ` zip ` ` (` ` * ` ` t)) ` ` for ` ` t ` ` in ` ` zip ` ` (X, Y)] `

` print ` ` (result) `

Output:

` [[10, 10, 10], [10, 10, 10 ], [10, 10, 10]] `

Explanation: —
The zip function takes an iterator i of each element (list) of the matrix, displays them, adds them with sum () and stores them in map form.

This article courtesy of ajay0007 . If you are as Python.Engineering and would like to contribute, you can also write an article using contribute.python.engineering or by posting an article contribute @ python.engineering. See my article appearing on the Python.Engineering homepage and help other geeks.

Please post comments if you find anything wrong or if you would like to share more information on the topic discussed above.

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