\alias{ltt.plot}
\alias{ltt.lines}
\alias{mltt.plot}
+\alias{ltt.coplot}
+\alias{ltt.plot.coords}
\title{Lineages Through Time Plot}
+\description{
+ These functions provide tools for plotting the numbers of lineages
+ through time from phylogenetic trees.
+}
\usage{
-ltt.plot(phy, xlab = "Time", ylab = "N", ...)
-ltt.lines(phy, ...)
+ltt.plot(phy, xlab = "Time", ylab = "N",
+ backward = TRUE, tol = 1e-6, ...)
+ltt.lines(phy, backward = TRUE, tol = 1e-6, ...)
mltt.plot(phy, ..., dcol = TRUE, dlty = FALSE, legend = TRUE,
- xlab = "Time", ylab = "N", log = "")
+ xlab = "Time", ylab = "N", log = "", backward = TRUE,
+ tol = 1e-6)
+ltt.coplot(phy, backward = TRUE, ...)
+ltt.plot.coords(phy, backward = TRUE, tol = 1e-6)
}
\arguments{
\item{phy}{an object of class \code{"phylo"}; this could be an object
of class \code{"multiPhylo"} in the case of \code{mltt.plot}.}
\item{xlab}{a character string (or a variable of mode character)
- giving the label for the x-axis (default is "Time").}
- \item{ylab}{idem for the y-axis (default is "N").}
- \item{\dots}{in the cases of \code{ltt.plot()} and \code{ltt.lines()}
- these are further (graphical) arguments to be passed to
- \code{plot()} or \code{lines()}, respectively (see \code{Details:}
- on how to transform the axes); in the case \code{mltt.plot()} these
- are additional trees to be plotted (see \code{Details:}).}
+ giving the label for the \eqn{x}-axis (default is "Time").}
+ \item{ylab}{idem for the \eqn{y}-axis (default is "N").}
+ \item{backward}{a logical value: should the time axis be traced from
+ the present (the default), or from the root of the tree?}
+ \item{tol}{a numeric value (see details).}
+ \item{\dots}{in the cases of \code{ltt.plot()}, \code{ltt.lines()},
+ or \code{ltt.coplot()} these are further (graphical) arguments to be
+ passed to \code{plot()}, \code{lines()}, or \code{plot.phylo()},
+ respectively (see details on how to transform the axes); in
+ the case \code{mltt.plot()} these are additional trees to be plotted
+ (see details).}
\item{dcol}{a logical specifying whether the different curves should
be differentiated with colors (default is \code{TRUE}).}
\item{dlty}{a logical specifying whether the different curves should
log-transformed; must be one of the followings: \code{""},
\code{"x"}, \code{"y"}, or \code{"xy"}.}
}
-\description{
- These functions plot, on the current graphical device, the minimum
- numbers of lineages through time from phylogenetic trees.
-}
\details{
\code{ltt.plot} does a simple lineages through time (LTT)
- plot. Additional arguments (\code{...}) may be used to change, for
+ plot. Additional arguments (\code{\dots}) may be used to change, for
instance, the limits on the axes (with \code{xlim} and/or
\code{ylim}) or other graphical settings (\code{col} for the color,
\code{lwd} for the line thickness, \code{lty} for the line type may be
graphical parameters). The \eqn{y}-axis can be log-transformed by
adding the following option: \code{log = "y"}.
+ The option \code{tol} is used as follows: first the most distant tip
+ from the root is found, then all tips whose distance to the root is
+ not more different from the previous one than \code{tol} are
+ considered to be contemporaneous with it.
+
+ If the tree is not ultrametric, the plot is done assuming the tips,
+ except the most distant from the root, represent extinction events. If
+ a root edge is present, it is taken into account.
+
\code{ltt.lines} adds a LTT curve to an existing plot. Additional
- arguments (\code{...}) may be used to change the settings of the added
- line. Of course, the settings of the already existing LTT plot cannot
- be altered this way.
+ arguments (\code{\dots}) may be used to change the settings of the added
+ line.
\code{mltt.plot} does a multiple LTT plot taking as arguments one or
several trees. These trees may be given as objects of class
- \code{"phylo"} (single trees) or \code{"multiPhylo"} (multiple
+ \code{"phylo"} (single trees) and/or \code{"multiPhylo"} (multiple
trees). Any number of objects may be given. This function is mainly
for exploratory analyses with the advantages that the axes are set
properly to view all lines, and the legend is plotted by default. For
- more flexible settings of line drawings, it is probably better to
- combine \code{ltt.plot()} with successive calls of \code{ltt.lines()}
- (see \code{Examples:}).
+ more flexible settings of line drawings, it may be better to combine
+ \code{ltt.plot()} with successive calls of \code{ltt.lines()} (see
+ examples).
+
+ \code{ltt.coplot} is meant to show how to set a tree and a LTT plots
+ on the same scales. All extra arguments modify only the appearance of
+ the tree. The code can be easily edited and tailored.
+}
+\value{
+ \code{ltt.plot.coords} returns a two-column matrix with the time
+ points and the number of lineages, respectively. The \eqn{i}th value
+ of the second column is the number of lineages for the interval
+ defined by the \eqn{(i - 1)}th and the \eqn{i}th values of the first
+ column. These are then plotted with the option \code{type = "S"} by
+ the other functions.
}
\references{
Harvey, P. H., May, R. M. and Nee, S. (1994) Phylogenies without
\seealso{
\code{\link{skyline}}, \code{\link{branching.times}},
\code{\link{birthdeath}}, \code{\link{bd.ext}},
- \code{\link{yule.cov}}, \code{\link{bd.time}}
+ \code{\link{yule.cov}}, \code{\link{bd.time}};
\code{\link[graphics]{plot}} for the basic plotting function in R
}
\examples{
data(bird.families)
-data(bird.orders)
opar <- par(mfrow = c(2, 1))
ltt.plot(bird.families)
title("Lineages Through Time Plot of the Bird Families")
title(main = "Lineages Through Time Plot of the Bird Families",
sub = "(with logarithmic transformation of the y-axis)")
par(opar)
+
### to plot the tree and the LTT plot together
+data(bird.orders)
layout(matrix(1:4, 2, 2))
plot(bird.families, show.tip.label = FALSE)
ltt.plot(bird.families, main = "Bird families")
plot(bird.orders, show.tip.label = FALSE)
ltt.plot(bird.orders, main = "Bird orders")
-layout(matrix(1))
+layout(1)
+
+### better with ltt.coplot():
+ltt.coplot(bird.families, show.tip.label = FALSE, x.lim = 27.5)
+data(chiroptera)
+chiroptera <- compute.brlen(chiroptera)
+ltt.coplot(chiroptera, show.tip.label = FALSE, type = "c")
+
+### with extinct lineages and a root edge:
+omar <- par("mar")
+set.seed(31)
+tr <- rlineage(0.2, 0.15)
+tr$root.edge <- 5
+ltt.coplot(tr, show.tip.label = FALSE, x.lim = 55)
+## compare with:
+## ltt.coplot(drop.fossil(tr), show.tip.label = FALSE)
+layout(1)
+par(mar = omar)
+
mltt.plot(bird.families, bird.orders)
### Generates 10 random trees with 23 tips:
TR <- replicate(10, rcoal(23), FALSE)
### And now for something (not so) completely different:
ltt.plot(bird.orders, lwd = 2)
for (i in 1:10) ltt.lines(TR[[i]], lty = 2)
-legend(-10, 5, lwd = c(2, 1), lty = c(1, 2), bty = "n",
- legend = c("Bird orders", "Random trees"))
+legend(-20, 10, lwd = c(2, 1), lty = c(1, 2), bty = "n",
+ legend = c("Bird orders", "Random (coalescent) trees"))
}
\keyword{hplot}
\keyword{aplot}
projects / ape.git / blobdiff