# Python | Remove duplicates in Matrix

While working with Python Matrix, we can face a problem in which we need to perform the removal of duplicates from Matrix. This problem can occur in Machine Learning domain because of extensive usage of matrices. Let’s discuss certain way in which this task can be performed.

Method : Using loop
This task can be performed in brute force manner using loops. In this, we just iterate the list of list using loop and check for the already presence of element, and append in case it’s new element, and construct a non-duplicate matrix.

 `# Python3 code to demonstrate working of ` `# Removing duplicates in Matrix ` `# using loop ` ` `  `# initialize list  ` `test_list ``=` `[[``5``, ``6``, ``8``], [``8``, ``5``, ``3``], [``9``, ``10``, ``3``]] ` ` `  `# printing original list ` `print``(``"The original list is : "` `+` `str``(test_list)) ` ` `  `# Removing duplicates in Matrix ` `# using loop ` `res ``=` `[] ` `track ``=` `[] ` `count ``=` `0` ` `  `for` `sub ``in` `test_list: ` `    ``res.append([]); ` `    ``for` `ele ``in` `sub: ` `        ``if` `ele ``not` `in` `track: ` `             ``res[count].append(ele) ` `             ``track.append(ele) ` `    ``count ``+``=` `1` ` `  `# printing result ` `print``(``"The Matrix after duplicates removal is : "` `+` `str``(res)) `

Output :

```The original list is : [[5, 6, 8], [8, 5, 3], [9, 10, 3]]
The Matrix after duplicates removal is : [[5, 6, 8], [3], [9, 10]]
```

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