ablineclip {plotrix}R Documentation

Add a straight line to a plot

Description

As abline, but has arguments x1,x2,y1,y2 as in 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

a Intercept.
b Slope.
h the x-value(s) for vertical line(s).
v the y-value(s) for horizontal line(s).
reg Fitted lm object.
coef Coefficients, typically intercept and slope.
untf How to plot on log coordinates, see abline.
x1,x2,y1,y2 Clipping limits, see clip.
... Further arguments passed to abline.

Details

ablineclip sets a new clipping region and then calls abline. If any of the four clipping limits is NULL, the values from par("usr") are substituted. After the call to abline, the old clipping region is restored. In order to make clip work, there is a call to abline that draws a line off the plot.

Value

None. Adds to the current plot.

Author(s)

Remko Duursma

See Also

abline

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")

[Package plotrix version 2.7-2 Index]