Symmetric Dense Logical Matrices

The "lsyMatrix" class is the class of symmetric, dense logical matrices in non-packed storage and "lspMatrix" is the class of of these in packed storage. In the packed form, only the upper triangle or the lower triangle is stored.

Objects from the Class

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

Slots

uplo:

Object of class "character". Must be either "U", for upper triangular, and "L", for lower triangular.

x:

Object of class "logical". The logical values that constitute the matrix, stored in column-major order.

Dim,Dimnames:

The dimension (a length-2 "integer") and corresponding names (or NULL), see the Matrix class.

factors:

Object of class "list". A named list of factorizations that have been computed for the matrix.

Extends

Both extend classes "ldenseMatrix" and "symmetricMatrix", directly; further, class "Matrix" and others, indirectly. Use showClass("lsyMatrix"), e.g., for details.

Methods

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

See also

lgeMatrix, Matrix, t

Examples

(M2 <- Matrix(c(TRUE, NA, FALSE, FALSE), 2, 2)) # logical dense (ltr)
#> 2 x 2 Matrix of class "ltrMatrix"
#>       [,1]  [,2]
#> [1,]  TRUE     .
#> [2,]    NA FALSE
str(M2)
#> Formal class 'ltrMatrix' [package "Matrix"] with 5 slots
#>   ..@ Dim     : int [1:2] 2 2
#>   ..@ Dimnames:List of 2
#>   .. ..$ : NULL
#>   .. ..$ : NULL
#>   ..@ x       : logi [1:4] TRUE NA FALSE FALSE
#>   ..@ uplo    : chr "L"
#>   ..@ diag    : chr "N"
# can
(sM <- M2 | t(M2)) # "lge"
#> 2 x 2 Matrix of class "lgeMatrix"
#>      [,1]  [,2]
#> [1,] TRUE    NA
#> [2,]   NA FALSE
as(sM, "symmetricMatrix")
#> 2 x 2 Matrix of class "lsyMatrix"
#>      [,1]  [,2]
#> [1,] TRUE    NA
#> [2,]   NA FALSE
str(sM <- as(sM, "packedMatrix")) # packed symmetric
#> Formal class 'lspMatrix' [package "Matrix"] with 5 slots
#>   ..@ uplo    : chr "U"
#>   ..@ Dim     : int [1:2] 2 2
#>   ..@ Dimnames:List of 2
#>   .. ..$ : NULL
#>   .. ..$ : NULL
#>   ..@ x       : logi [1:3] TRUE NA FALSE
#>   ..@ factors : list()