[R] Questions on plotting using zoo toolbox: (1) dual axes (2)legend

[Gabor Grothendieck]

On Thu, Mar 22, 2012 at 4:38 AM, jpm miao <miaojpm at gmail.com> wrote:
> Hi,
>
>   I have three time series and I would like to plot them on the same graph
> such that two of them share left y-axis and the third uses right y-axis.
>
> rm(list=ls())
> library(zoo)
> x1 <- read.csv(file="120322DBCdata.csv", header=TRUE)
> x1date<-as.yearqtr(1979)+seq(0,nrow(x1)-1)/4
> x1zoo<-zoo(x1, x1date, frequency=4)
> x1zoodata<-cbind(x1zoo$D4GDP, x1zoo$D4NE, x1zoo$CEPDexpansion)
> plot(x1zoodata, screen=1)
>
> My questions are:
> 1. How can I have the second y-axis on the right?
> 2.
>    The only legend shown in the graph is "x1zoodata", but I would like to
> see the names of the components, namely, "D4GDP", "D4NE" and
> "CEPDrecession".   How can I do it?
>

See the double axis example in the examples section of ?plot.zoo

(Also read the last two lines of every message to r-help and
particularly note the part about posting reproducible examples.)

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