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\name{feather.plot}
\alias{feather.plot}
\title{ Display vectors along a horizontal reference line }
\description{
Displays vectors along a line usually representing time or position.
}
\usage{
feather.plot(r,theta,xpos,yref=0,use.arrows=TRUE,
col.refline="lightgray",fp.type="s",main="",xlab="",ylab="",
xlabels=NULL,...)
}
\arguments{
\item{r}{radii of vectors}
\item{theta}{direction of vectors in radians}
\item{xpos}{where to start each vector along the reference line}
\item{yref}{vertical position to place the reference line}
\item{use.arrows}{whether to put arrow heads on the ends of the vectors}
\item{col.refline}{the color of the reference line}
\item{fp.type}{whether to use "standard" coordinates (begin at the
right and move counterclockwise) or "meteorological" coordinates
(begin at the top and move clockwise) when interpreting the values
of \samp{theta}}
\item{main}{the title of the plot}
\item{xlab}{the label for the reference line}
\item{ylab}{the label for the vertical axis}
\item{xlabels}{optional labels for the reference line}
\item{...}{additional arguments passed to \samp{arrows} or \samp{segments}}
}
\details{
This function places vectors of length \samp{r} and angle \samp{theta}
along a reference line that may represent time or position or some other
value. The user is responsible for spacing the vectors so that they do
not overlap if this is desired.
}
\value{nil}
\author{Jim Lemon, Eduardo Klein}
\seealso{\link{spread.labels}}
\examples{
feather.plot(0.6+rnorm(8)/5,seq(0,7*pi/4,by=pi/4),1:8,
main="Standard Coordinates",xlab="Time",ylab="Value")
if(dev.interactive()) par(ask=TRUE)
feather.plot(0.6+rnorm(8)/5,seq(0,7*pi/4,by=pi/4),1:8,
main="Meteorological Coordinates",xlab="Time",ylab="Value",
fp.type="m",xlabels=TRUE)
par(ask=FALSE)
}
\keyword{misc}
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