dimScale  R Documentation 
dimScale
, rowScale
, and colScale
implement
D1 %*% x %*% D2
, D %*% x
, and x %*% D
for diagonal matrices D1
, D2
, and D
with
diagonal entries d1
, d2
, and d
, respectively.
Unlike the explicit products, these functions preserve dimnames(x)
and symmetry where appropriate.
dimScale(x, d1 = sqrt(1/diag(x, names = FALSE)), d2 = d1) rowScale(x, d) colScale(x, d)
x 
a matrix, possibly inheriting from virtual class

d1,d2,d 
numeric vectors giving factors by which to scale
the rows or columns of 
dimScale(x)
(with d1
and d2
unset) is only
roughly equivalent to cov2cor(x)
. cov2cor
sets the diagonal entries of the result to 1 (exactly);
dimScale
does not.
The result of scaling x
, currently always inheriting from
virtual class dMatrix
.
It inherits from triangularMatrix
if and only
if x
does. In the special case of dimScale(x, d1, d2)
with identical d1
and d2
, it inherits from
symmetricMatrix
if and only if x
does.
Mikael Jagan
cov2cor
n < 6L (x < forceSymmetric(matrix(1, n, n))) dimnames(x) < rep.int(list(letters[seq_len(n)]), 2L) d < seq_len(n) (D < Diagonal(x = d)) (scx < dimScale(x, d)) # symmetry and 'dimnames' kept (mmx < D %*% x %*% D) # symmetry and 'dimnames' lost stopifnot(identical(unname(as(scx, "generalMatrix")), mmx)) rowScale(x, d) colScale(x, d)
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