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\name{lambda.transform}
\alias{lambda.transform}
\title{\eqn{\lambda} transformation of matrix}
\usage{
lambda.transform(lambda, C)
}
\arguments{
\item{lambda}{scalar, usually (but not necessarily) on the interval 0,1.}
\item{C}{matrix probably returned by \code{\link[ape]{vcv.phylo}}.}
}
\description{
Internal function for \code{\link{phyl.pca}} and others.
}
\details{
Multiplies the off-diagonals of a square matrix by \code{lambda} and returns the result.
}
\value{
Typically an among-species phylogenetic variance covariance matrix (e.g., \code{\link[ape]{vcv.phylo}}) in which the off-diagonal elements have been multiplied by \code{lambda}.
}
\references{
Revell, L. J. (2024) phytools 2.0: an updated R ecosystem for phylogenetic comparative methods (and other things). \emph{PeerJ}, \bold{12}, e16505.
}
\author{Liam Revell \email{liam.revell@umb.edu}}
\keyword{phylogenetics}
\keyword{math}
\keyword{comparative method}
\keyword{utilities}
|
