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().

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().

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

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course.