slam (version 0.1-1)

simple_sparse_array: Simple Sparse Arrays

Description

Data structures and operators for sparse arrays based on a representation by index matrix and value vector.

Usage

simple_sparse_array(i, v, dim = NULL, dimnames = NULL)
as.simple_sparse_array(x)
is.simple_sparse_array(x)

Arguments

i

Integer matrix of array indices.

v

Vector of values.

dim

Integer vector specifying the size of the dimensions.

dimnames

either NULL or the names for the dimensions. This is a list with one component for each dimension, either NULL or a character vector of the length given by dim for that dimensi

x

An Robject.

Details

simple_sparse_array is a generator for a class of lightweight sparse arrays, represented by index matrices and value vectors. Currently, only methods for indexing and coercion are implemented.

See Also

simple_sparse_array for sparse arrays.

Examples

x <- array(c(1, 0, 0, 2, 0, 0, 0, 3), dim = c(2, 2, 2))
s <- as.simple_sparse_array(x)
identical(x, as.array(s))

simple_sparse_array(matrix(c(1, 1, 1, 3, 3, 3), nrow = 2), c(1, 2))