Question

What are sparse matrices? How can they be stored in memory?

Answer 1

Answer:

Representing a sparse matrix by a 2D array leads to wastage of lots of memory as zeroes in the matrix are of no use in most of the cases. So, instead of storing zeroes with non-zero elements, we only store non-zero elements. This means storing non-zero elements with triples- (Row, Column, value).

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Answer 2

Answer:

Explanation: the sparse matrix is a two dimensional array where the majority of the elements have the value null.it is used to avoid the wastage in memory space.