Show the sparsity (as a count or proportion) of a matrix. For example, .99 sparsity means 99% of the values are zero. Similarly, a sparsity of 0 means the matrix is fully dense.
The matrix, stored as an ordinary R matrix or as a "simple triplet matrix" (from the slam package).
Logical; should a proportion or a count be returned?
The implementation is very efficient for dense matrices. For sparse triplet matrices, the count is trivial.
The sparsity of the input matrix, as a proportion or a count.
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