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\name{ablineclip}
\alias{ablineclip}
\title{Add a straight line to a plot}
\description{
As \samp{abline}, but has arguments \samp{x1,x2,y1,y2} as in \samp{clip}.
}
\usage{
ablineclip(a=NULL,b=NULL,h=NULL,v=NULL,reg=NULL,coef=NULL,untf=FALSE,
x1=NULL,x2=NULL,y1=NULL,y2=NULL,...)
}
\arguments{
\item{a}{Intercept.}
\item{b}{Slope.}
\item{h}{the y-value(s) for horizontal line(s).}
\item{v}{the x-value(s) for vertical line(s).}
\item{reg}{Fitted lm object. }
\item{coef}{Coefficients, typically intercept and slope.}
\item{untf}{How to plot on log coordinates, see \samp{abline}.}
\item{x1,x2,y1,y2}{Clipping limits, see \samp{clip}.}
\item{...}{Further arguments passed to \samp{abline}.}
}
\details{
\samp{ablineclip} sets a new clipping region and then calls \samp{abline}.
If any of the four clipping limits is NULL, the values from \samp{par("usr")}
are substituted. After the call to \samp{abline}, the old clipping region
is restored. In order to make \samp{clip} work, there is a call to \samp{abline} that draws a line off the plot.
Multiple lines of the same type can be drawn in a single call, but the clipping region must be the same for each group of lines. Thanks to Berry Boessenkool for pointing this out.
}
\value{
None. Adds to the current plot.
}
\author{ Remko Duursma }
\seealso{\link{abline}, \link{clip}}
\examples{
x <- rnorm(100)
y <- x + rnorm(100)
lmfit <- lm(y~x)
plot(x, y, xlim=c(-3.5, 3.5))
ablineclip(lmfit, x1 = -2, x2 = 2, lty = 2)
ablineclip(h = 0, x1 = -2,x2 = 2,lty = 3, col = "red")
ablineclip(v = 0, y1 = -2.5, y2 = 1.5, lty=4, col = "green")
}
\keyword{ aplot }
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