extractors {sparsevctrs}

Information extraction from sparse vectors

Description

Extract positions, values, and default from sparse vectors without the need to materialize vector.

Usage

sparse_positions(x)

sparse_values(x)

sparse_default(x)

Arguments

x

vector to be extracted from.

Details

sparse_default() returns NA when applied to non-sparse vectors. This is done to have an indicator of non-sparsity.

for ease of use, these functions also works on non-sparse variables.

Value

vectors of requested attributes

Examples

x_sparse <- sparse_double(c(pi, 5, 0.1), c(2, 5, 10), 10)
x_dense <- c(0, pi, 0, 0, 0.5, 0, 0, 0, 0, 0.1)

sparse_positions(x_sparse)
sparse_values(x_sparse)
sparse_default(x_sparse)

sparse_positions(x_dense)
sparse_values(x_dense)
sparse_default(x_dense)

x_sparse_3 <- sparse_double(c(pi, 5, 0.1), c(2, 5, 10), 10, default = 3)
sparse_default(x_sparse_3)