twoord.plot {plotrix}R Documentation

Plot with two ordinates

Description

Two sets of values are displayed on the same plot with different ordinate scales on the left and right.

Usage

 twoord.plot(lx,ly,rx,ry,data=NULL,xlim=NULL,lylim=NULL,rylim=NULL,
 mar=NULL,lcol=1,rcol=2,xlab="",ylab="",rylab="",lpch=1,rpch=2,
 type="b",...)

Arguments

lx,ly,rx,ry y and optional x values for the plot
data an optional data frame from which to obtain the above values
xlim optional x limits as in plot
lylim,rylim optional y limits for the left and right axes respectively
mar optional margin adjustment, defaults to c(5,4,4,4)
lcol,rcol colors to distinguish the two sets of values
xlab,ylab axis labels as in plot
rylab label for the right axis
lpch,rpch plot symbols to distinguish the two sets of values
type as in plot
... additional arguments passed to axis.

Details

twoord.plot automates the process of displaying two sets of values that have different ranges on the same plot. It is principally useful in illustrating some relationship between the values across the observations.

It is best to pass all the arguments lx, ly, rx, ry, but the function will attempt to substitute sensible x values if one or two are missing.

Value

nil

Note

It may be useful to consider gap.plot as an alternative.

Author(s)

Jim Lemon

See Also

plot

Examples

 twoord.plot(2:10,seq(3,7,by=0.5)+rnorm(9),
  1:15,rev(60:74)+rnorm(15),xlab="Sequence",
  ylab="Ascending values",rylab="Descending values",
  main="Test of twoord.plot")

[Package plotrix version 2.2-8 Index]