dtrMatrix-class {Matrix} | R Documentation |
The "dtrMatrix"
class is the class of triangular, dense,
numeric matrices in nonpacked storage. The "dtpMatrix"
class
is the same except in packed storage.
Objects can be created by calls of the form new("dtrMatrix", ...)
.
uplo
:Object of class "character"
. Must be
either "U", for upper triangular, and "L", for lower triangular.
diag
:Object of class "character"
. Must be
either "U"
, for unit triangular (diagonal is all ones), or
"N"
; see triangularMatrix
.
x
:Object of class "numeric"
. The numeric
values that constitute the matrix, stored in column-major order.
Dim
:Object of class "integer"
. The dimensions
of the matrix which must be a two-element vector of non-negative
integers.
Class "ddenseMatrix"
, directly.
Class "triangularMatrix"
, directly.
Class "Matrix"
and others, by class "ddenseMatrix"
.
signature(x = "dtrMatrix", y = "matrix")
and other
signatures (use showMethods("%*%", class="dtrMatrix")
):
matrix multiplication. Multiplication of (matching) triangular
matrices now should remain triangular (in the sense of class
triangularMatrix).
signature(x = "dtrMatrix", y = "matrix")
and other
signatures, see "%*%"
above.
signature(from = "dgeMatrix", to = "dtrMatrix")
signature(from = "dtrMatrix", to = "matrix")
signature(from = "dtrMatrix", to = "ltrMatrix")
signature(from = "dtrMatrix", to = "matrix")
signature(from = "matrix", to = "dtrMatrix")
signature(x = "dtrMatrix", type = "character")
signature(x = "dtrMatrix", norm = "character")
signature(a = "dtrMatrix", b = "missing")
signature(a = "dtrMatrix", b = "matrix")
all the Ops
group
methods are available. When applied to two triangular matrices,
these return a triangular matrix when easily possible.
Classes ddenseMatrix
, dtpMatrix
,
triangularMatrix
(m <- rbind(2:3, 0:-1)) (M <- as(m, "dgeMatrix")) (T <- as(M, "dtrMatrix")) ## upper triangular is default (T2 <- as(t(M), "dtrMatrix")) stopifnot(T@uplo == "U", T2@uplo == "L", identical(T2, t(T)))