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% File nlme/man/pdMatrix.reStruct.Rd
% Part of the nlme package for R
% Distributed under GPL 2 or later: see nlme/LICENCE.note
\name{pdMatrix.reStruct}
\title{Extract Matrix or Square-Root Factor from Components of an
reStruct Object}
\usage{
\method{pdMatrix}{reStruct}(object, factor)
}
\alias{pdMatrix.reStruct}
\arguments{
\item{object}{an object inheriting from class \code{"\link{reStruct}"},
representing a random effects structure and consisting of a list of
\code{pdMat} objects.}
\item{factor}{an optional logical value. If \code{TRUE}, square-root
factors of the positive-definite matrices represented by the elements
of \code{object} are returned; else, if \code{FALSE}, the
positive-definite matrices are returned. Defaults to \code{FALSE}.}
}
\description{
This method function extracts the positive-definite matrices
corresponding to the \code{pdMat} elements of \code{object}, or
square-root factors of the positive-definite matrices.
}
\value{
a list with components given by the positive-definite matrices
corresponding to the elements of \code{object}, or square-root factors
of the positive-definite matrices.
}
\references{
Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models
in S and S-PLUS", Springer, esp. p. 162.
}
\author{José Pinheiro and Douglas Bates \email{bates@stat.wisc.edu}}
\seealso{\code{\link{as.matrix.reStruct}},
\code{\link{reStruct}},
\code{\link{pdMat}},
\code{\link{pdMatrix}},
\code{\link{pdMatrix.pdMat}}
}
\examples{
rs1 <- reStruct(pdSymm(diag(3), ~age+Sex, data = Orthodont))
pdMatrix(rs1)
}
\keyword{models}
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