Matrix (version 0.95-5)

dsyMatrix-class: Symmetric, dense matrices

Description

The "dsyMatrix" class is the class of symmetric, dense matrices in non-packed storage and "dsyMatrix" is the class of symmetric dense matrices 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("dsyMatrix", ...).

Extends

Class "dgeMatrix", directly. Class "Matrix", by class "dgeMatrix".

See Also

dgeMatrix-class, Matrix-class, solve, norm, rcond, t

Examples

## Only upper triangular part matters (when uplo == "U" as per default)
(sy2 <- new("dsyMatrix", Dim = as.integer(c(2,2)), x = c(14, NA,32,77)))
(c2 <- chol(sy2))
str(c2)

## An example where chol() can't work
(sy3 <- new("dsyMatrix", Dim = as.integer(c(2,2)), x = c(14, -1, 2, -7)))

## gives an error in R <= 2.0.0 :
validObject(as(sy3, "dpoMatrix"), test=TRUE) # >> is not pos.def.
try(chol(sy3)) ## Error: not pos.def