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Python | Non-Repeating value Summation in Matrix
• Last Updated : 19 Feb, 2020

Sometimes we need to find the unique values in a list, that is comparatively easy and its summation and has been discussed earlier. But we can also get a matrix as input i.e a list of lists, finding unique in them are discussed in this article. Let’s see certain ways in which this can be achieved.

Method #1 : Using `set() + list comprehension + sum()`
The set function can be used to convert the individual list to a non-repeating element list and the list comprehension is used to iterate to each of the lists. The task of performing summation is performed using sum().

 `# Python3 code to demonstrate ` `# Non-Repeating value Summation in Matrix ` `# set() + list comprehension + sum() ` ` `  `# initializing matrix  ` `test_matrix ``=` `[[``1``, ``3``, ``1``], [``4``, ``5``, ``3``], [``1``, ``2``, ``4``]] ` ` `  `# printing the original matrix ` `print` `(``"The original matrix is : "` `+` `str``(test_matrix)) ` ` `  `# using set() + list comprehension + sum() ` `# Non-Repeating value Summation in Matrix ` `res ``=` `sum``(``list``(``set``(i ``for` `j ``in` `test_matrix ``for` `i ``in` `j))) ` ` `  `# printing result ` `print` `(``"Unique values summation in matrix are : "` `+` `str``(res)) `

Output :

```The original matrix is : [[1, 3, 1], [4, 5, 3], [1, 2, 4]]
Unique values summation in matrix are : 15
```

Method #2 : Using `chain() + set() + sum()`
The chain function performs the similar task that a list comprehension performs but in a faster way as it uses iterators for its internal processing and hence faster. The task of performing summation is performed using sum().

 `# Python3 code to demonstrate ` `# Non-Repeating value Summation in Matrix ` `# chain() + set() + sum() ` `from` `itertools ``import` `chain ` ` `  `# initializing matrix  ` `test_matrix ``=` `[[``1``, ``3``, ``1``], [``4``, ``5``, ``3``], [``1``, ``2``, ``4``]] ` ` `  `# printing the original matrix ` `print` `(``"The original matrix is : "` `+` `str``(test_matrix)) ` ` `  `# using chain() + set() + sum() ` `# Non-Repeating value Summation in Matrix ` `res ``=` `sum``(``list``(``set``(chain(``*``test_matrix)))) ` ` `  `# printing result ` `print` `(``"Unique values summation in matrix are : "` `+` `str``(res)) `

Output :

```The original matrix is : [[1, 3, 1], [4, 5, 3], [1, 2, 4]]
Unique values summation in matrix are : 15
```

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