| ltrMatrix-class {Matrix} | R Documentation |
The "ltrMatrix" class is the class of triangular, dense,
logical matrices in nonpacked storage. The "ltpMatrix" class
is the same except in packed storage.
x:Object of class "logical". The logical
values that constitute the matrix, stored in column-major order.
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.
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.
Both extend classes "ldenseMatrix" and
"triangularMatrix", directly; further, class
"Matrix", "lMatrix" and others,
indirectly. Use showClass("ltrMatrix"), e.g.,
for details.
Currently, mainly t() and coercion methods (for
as(.); use, e.g.,
showMethods(class="ltpMatrix") for details.
Classes lgeMatrix, Matrix;
function t
showClass("ltrMatrix")
str(new("ltpMatrix"))
(lutr <- as(upper.tri(matrix(,4,4)), "ltrMatrix"))
str(lutp <- as(lutr, "ltpMatrix"))# packed matrix: only 10 = (4+1)*4/2 entries
!lutp ## the logical negation (is *not* logical triangular !)
## but this one is:
stopifnot(all.equal(lutp, as(!!lutp, "ltpMatrix")))