Coerce numeric vector to sparse double

Takes a numeric vector, integer or double, and turn it into a sparse double vector.

Usage

as_sparse_double(x, default = 0)

as_sparse_integer(x, default = 0L)

as_sparse_character(x, default = "")

as_sparse_logical(x, default = FALSE)

Arguments

x

a numeric vector.

default

default value to use. Defaults to 0.

The values of x must be double or integer. It must not contain any Inf or NaN values.

Examples

x_dense <- c(3, 0, 2, 0, 0, 0, 4, 0, 0, 0)
x_sparse <- as_sparse_double(x_dense)
x_sparse
#>  [1] 3 0 2 0 0 0 4 0 0 0

is_sparse_double(x_sparse) 
#> [1] TRUE