simple_triplet_matrix {slam} | R Documentation |
Data structures and operators for sparse matrices based on simple triplet representation.
simple_triplet_matrix(i, j, v, nrow = max(i), ncol = max(j), dimnames = NULL) simple_triplet_zero_matrix(nrow, ncol = nrow, mode = "double") simple_triplet_diag_matrix(v, nrow = length(v)) as.simple_triplet_matrix(x) is.simple_triplet_matrix(x)
i, j |
Integer vectors of row and column indices, respectively. |
v |
Vector of values. |
nrow, ncol |
Integer values specifying the number of rows and columns, respectively. Defaults are the maximum row and column indices, respectively. |
dimnames |
A |
mode |
Character string specifying the mode of the values. |
x |
An R object. |
simple_triplet_matrix
is a generator for
a class of “lightweight” sparse matrices, “simply”
represented by triplets (i, j, v)
of row indices i
, column
indices j
, and values v
, respectively.
simple_triplet_zero_matrix
and
simple_triplet_diag_matrix
are convenience functions for the
creation of empty and diagonal matrices.
Currently implemented operations include the addition, subtraction,
multiplication and division of compatible simple triplet matrices,
as well as the multiplication and division of a simple triplet matrix
and a vector. Comparisons of the elements of a simple triplet
matrices with a number are also provided. In addition,
methods for indexing, combining by rows
(rbind
) and columns (cbind
), transposing (t
),
concatenating (c
), and detecting/extracting duplicated and
unique rows are implemented.
simple_sparse_array
for sparse arrays.
x <- matrix(c(1, 0, 0, 2), nrow = 2) s <- as.simple_triplet_matrix(x) identical(x, as.matrix(s)) simple_triplet_matrix(c(1, 4), c(1, 2), c(1, 2)) simple_triplet_zero_matrix(3) simple_triplet_diag_matrix(1:3) cbind(rbind(x, t(x)), rbind(x, x))