Matrix (version 0.999375-46)

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.

Objects from the Class

Objects can be created by calls of the form new("nsyMatrix", ...).

Extends

"nsyMatrix" extends class "ngeMatrix", directly, whereas "nspMatrix" extends class "ndenseMatrix", directly.

Both extend class "symmetricMatrix", directly, and class "Matrix" and others, indirectly, use showClass("nsyMatrix"), e.g., for details.

Methods

Currently, mainly t() and coercion methods (for as(.); use, e.g., showMethods(class="dsyMatrix") for details.

See Also

ngeMatrix, Matrix, t

Examples

(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, "nsyMatrix")) # -> "nsy"
str ( sM <- as(sM, "nspMatrix")) # -> "nsp": packed symmetric