Matrix (version 0.999375-2)

sparseMatrix-class: Virtual Class "sparseMatrix" --- Mother of Sparse Matrices

Description

Virtual Mother Class of All Sparse Matrices

Extends

Class "Matrix", directly.

Examples

showClass("sparseMatrix") ## and look at the help() of its subclasses
M <- Matrix(0, 10000, 100)
M[1,1] <- M[2,3] <- 3.14
M  ## show(.) method suppresses printing of the majority of rows

## factor -> t( <sparse design matrix> ) :
(fact <- gl(5, 3, 30, labels = LETTERS[1:5]))
(Xt <- as(fact, "sparseMatrix"))  # indicator rows
X <- t(Xt)