sitar (version 1.0.4)

xaxsd: Par args xaxs and yaxs option d

Description

Implements par('xaxs') and par('yaxs') option 'd'.

Usage

xaxsd(usr = par()$usr[1:2])
yaxsd(usr = par()$usr[3:4])

Arguments

usr

a length-2 vector defining the length of the x-axis or y-axis.

Value

• By default returns xlim/ylim args to match current setting of par()$usr, i.e. previous plot scales. Specifying usr gives scales with the usr args at the extremes. If par('xlog') or par('ylog') are set the returned limits are antilogged (to base 10).

Details

Implements par('xaxs') and par('yaxs') option 'd', i.e. uses previous axis scales in a new plot.

Examples

## generate and plot 100 data points
x <- rnorm(100)
y <- rnorm(100)
plot(x, y, pch=19)

## generate and plot 10 more 
## constraining axis scales to be as before
x <- rnorm(10)
y <- rnorm(10)
plot(x, y, pch=19, xlim=xaxsd(), ylim=yaxsd())

## force axis extremes to be -3 and 3
plot(x, y, pch=19, xlim=xaxsd(c(-3,3)), ylim=yaxsd(c(-3,3)))