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Vector arithmatic with sparse vectors

Source: R/arithmatic.R
sparse-arithmatic.Rd

Do arithmatic operations on sparse vectors while trying to void destroying the sparsity.

Usage

sparse_multiplication(x, y)

Arguments

x

A numeric vector.

y

A numeric vector.

Value

A sparse vector of same type.

Details

Note that this function works with both sparse and dense vectors for both x and y, returning a sparse or dense vector according to the input.

For sparse_multiplication() the class of the resulting vector depends on the classes of x and y. If both x and y are integer vectors then an integer vector is returned, otherwise a double vector is returned.

sparse_multiplication() will return a non-sparse vector if both x and y is non-sparse. Otherwise a sparse vector is returned.

sparse_multiplication() will destroy sparsity of sparse vectors with non-0 default values.

Examples

x_sparse <- sparse_double(c(pi, 5, 0.1), c(2, 5, 10), 10)

sparse_multiplication(x_sparse, x_sparse)
#>  [1]  0.000000  9.869604  0.000000  0.000000 25.000000  0.000000
#>  [7]  0.000000  0.000000  0.000000  0.010000