What does "sparse matrix" mean in programming?
sparse matrix is one of the most common terms in software development. This guide explains what it means, how it is used in practice, and why it matters, with real examples from the developer world.
Definition
A matrix in which most elements are zero. Storing it as a full 2D array wastes memory, so sparse matrices are stored using compact formats (like a list of (row, col, value) triples) that only record non-zero entries. Common in machine learning, graph algorithms, and scientific computing.
Example
"A 1 million by 1 million adjacency matrix for a sparse graph is stored as a sparse matrix to avoid 1 TB of RAM."
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