\name{radial.plot.labels}
\title{Display labels on a circular grid}
\usage{
 radial.plot.labels(lengths,radial.pos=NULL,units="radians",radial.lim=NULL,
  start=0,clockwise=FALSE,labels,adj=NULL,pos=NULL,...)
}
\alias{radial.plot.labels}
\arguments{
 \item{lengths}{numeric data vector. Magnitudes will be represented as
  the radial positions of symbols, line ends or polygon vertices.}
 \item{radial.pos}{numeric vector of radial positions. These will be 
  converted to radians if the \samp{units} argument is not "radians".}
 \item{units}{The units of \samp{radial.pos} may be degrees or 24 hour clock
  positions. If \samp{units} is "polar" or "clock24" respectively, the
  values of radial.pos will be converted into radians.}
 \item{radial.lim}{Optional radial limits for the circular plot. These
  must be the same as the radial limits of the original plot.}
 \item{start}{The zero position on the plot in the units of \samp{radial.pos}.}
 \item{clockwise}{Whether to increase angles clockwise rather than the
  default counterclockwise.}
 \item{labels}{text labels to display on the plot.}
 \item{adj}{Text justification as in the \samp{text} function.}
 \item{pos}{Text position as in the \samp{text} function.}
 \item{...}{additional arguments passed to \samp{text}.}
}
\description{
 \samp{radial.plot.labels} displays a labels on a circular plot produced by
  one of the radial.plot family of functions.
}
\details{
 Don't confuse this function with the \samp{radial.labels} argument in
 the radial.plot function. This labels the values rather than the grid.
}
\value{nil}
\author{Jim Lemon}
\keyword{misc}
\seealso{\link{text}}
\examples{
 testlen<-c(rnorm(10)*2+5)
 # do the labels in clock24 units
 testpos<-c(6.74,8.3,10.55,12.33,13.75,15.9,17.15,19.36,21.02,23.27)
 oldpar<-clock24.plot(testlen,testpos,main="Test radial.plot.labels",
  rp.type="s",point.symbols=3,point.col="blue")
 radial.plot.labels(testlen,testpos,units="clock24",labels=LETTERS[1:10],
  pos=3,col="blue")
 testangle<-c(25,42,67,94,128,173,191,234,268,307)
 # now a polar plot
 polar.plot(testlen,testangle,main="Test radial.plot.labels",rp.type="p",
  poly.col="green")
 radial.plot.labels(testlen,testangle,units="polar",labels=LETTERS[1:10])
 # reset par
 par(oldpar)
}