Description Usage Arguments Details Value Examples
“Packed” matrix storage here applies to dense matrices
(denseMatrix
) only, and there is available only
for symmetric (symmetricMatrix
)
or triangular (triangularMatrix
) matrices,
where only one triangle of the matrix needs to be stored.
unpack()
unpacks “packed” matrices, where
pack()
produces “packed” matrices.
1 2 3 4 5 |
x |
|
symmetric |
logical (including |
upperTri |
(for the triangular case only) logical
(incl. |
... |
further arguments passed to or from other methods. |
These are generic functions with special methods for different types
of packed (or non-packed) symmetric or triangular dense
matrices. Use showMethods("unpack")
to list
the methods for unpack()
, and similarly for pack()
.
unpack()
:A Matrix
object
containing the full-storage representation of x
.
pack()
:A packed Matrix
(i.e. of class "..pMatrix"
)
representation of x
.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | showMethods("unpack")
(cp4 <- chol(Hilbert(4))) # is triangular
tp4 <- as(cp4,"dtpMatrix")# [t]riangular [p]acked
str(tp4)
(unpack(tp4))
stopifnot(identical(tp4, pack(unpack(tp4))))
(s <- crossprod(matrix(sample(15), 5,3))) # traditional symmetric matrix
(sp <- pack(s))
mt <- as.matrix(tt <- tril(s))
(pt <- pack(mt))
stopifnot(identical(pt, pack(tt)),
dim(s ) == dim(sp), all(s == sp),
dim(mt) == dim(pt), all(mt == pt), all(mt == tt))
showMethods("pack")
|
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