Matrix (version 1.7-6)

nsyMatrix-class: Symmetric Dense Nonzero-Pattern Matrices

Description

The "nsyMatrix" class is the class of symmetric, dense nonzero-pattern matrices in non-packed storage and "nspMatrix" is the class of of these in packed storage. Only the upper triangle or the lower triangle is stored.

See Also

ngeMatrix, Matrix, t

Examples

 
library(utils, pos = "package:base", verbose = FALSE)

(s0 <- new("nsyMatrix"))

(M2 <- Matrix(c(TRUE, NA, FALSE, FALSE), 2, 2)) # logical dense (ltr)
(sM <- M2 & t(M2))                       # -> "lge"
class(sM <- as(sM, "nMatrix"))           # -> "nge"
     (sM <- as(sM, "symmetricMatrix"))   # -> "nsy"
str(sM <- as(sM, "packedMatrix")) # -> "nsp", i.e., packed symmetric