triplet {spam}R Documentation

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.list 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)
[Package spam version 0.15-3 Index]