triplet: Transform a "spam" Format to Triplets

In spam: SPArse Matrix

Transform a "spam" Format to Triplets

Description

Returns a list containing the indices and elements of a spam object.

Usage

triplet(x, tri=FALSE)

Arguments

x	sparse matrix of class spam or a matrix.
tri	Boolean indicating whether to create individual row and column indices vectors.

Details

The elements are row (column) first if x is a spam object (matrix).

Value

A list with elements

indices	a by two matrix containing the indices if tri=FALSE.
i, j	vectors containing the row and column indices if tri=TRUE.
values	a vector containing the matrix elements.

Author(s)

Reinhard Furrer

See Also

spam.creation for the inverse operation and foreign for other transformations.

Examples

x <- diag.spam(1:4)
x[2,3] <- 5
triplet(x)
all.equal( spam( triplet(x, tri=TRUE)), x)

spam documentation built on April 4, 2025, 5:13 a.m.