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\name{sim.corrs}
\alias{sim.corrs}
\title{Multivariate Brownian simulation with multiple correlations and rates}
\usage{
sim.corrs(tree, vcv, anc=NULL, internal=FALSE)
}
\arguments{
\item{tree}{is a phylogenetic tree in 'phylo' format; or a modified 'phylo' tree with a mapped discrete character.}
\item{vcv}{is a square covariance matrix or named list of matrices (one for each mapped state on the tree).}
\item{anc}{optional vector of values for the root state.}
\item{internal}{logical value indicating whether to return states at internal nodes.}
}
\description{
This function conducts BM simulation on a tree with multiple rates and/or multiple evolutionary correlations between characters. If \code{vcv} is a single matrix, instead of a list of matrices, \code{sim.corrs} will simulate multivariate BM with a single rate matrix.
}
\value{
A matrix containing the multivariate tip states for the \code{n} species in the tree (and nodes if \code{internal=} \code{TRUE}).
}
\references{
Revell, L. J., and D. C. Collar (2009) Phylogenetic analysis of the evolutionary correlation using likelihood. \emph{Evolution}, \bold{63}, 1090-1100.
Revell, L. J. (2012) phytools: An R package for phylogenetic comparative biology (and other things). \emph{Methods Ecol. Evol.}, \bold{3}, 217-223.
}
\author{Liam Revell \email{liam.revell@umb.edu}}
\seealso{
\code{\link{fastBM}}, \code{\link{make.simmap}}, \code{\link{read.simmap}}, \code{\link{sim.history}}, \code{\link{sim.rates}}
}
\keyword{phylogenetics}
\keyword{simulation}
\keyword{comparative method}
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