ablineclip {plotrix}

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 y-value(s) for horizontal line(s).

v

the x-value(s) for vertical 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.

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(s)

Remko Duursma

See Also

abline, 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")