.\" -*- nroff -*- generated from .Rd format
.BG
.FN pdMatrix
.TL
Extract Matrix or Square-Root Factor from a pdMat Object
.DN
The positive-definite matrix represented by `object', or a
square-root factor of it is obtained. Letting S denote a
positive-definite matrix, a square-root factor of S is
any square matrix L such that S =
L'L. This function extracts S or L.
.CS
pdMatrix(object, fact, ...)
.RA
.AG object
an object inheriting from class `pdMat', representing
a positive definite matrix.
.OA
.AG fact
an optional logical value. If `TRUE', a square-root
factor of the positive-definite matrix represented by `object'
is returned; else, if `FALSE', the positive-definite matrix is
returned. Defaults to `FALSE'.
.AG ...
some methods for the generic function may require
additional arguments.
.RT
if `fact' is `FALSE' the positive-definite matrix
represented by `object' is returned; else a square-root of the
positive-definite matrix is returned.

.SA
`as.matrix.pdMat', `pdFactor',
`corMatrix'
.EX
pd1 <- pdSymm(diag(1:4))
pdMatrix(pd1)
.KW models
.WR
