[R] More than one series in a coplot

[Deepayan Sarkar]

On Friday 04 June 2004 23:04, Matthew Walker wrote:
> Hi!
>
> I would like to know, how do you plot more than one data series when
> using "coplot"?
>
> I think I know the answer if "plot" is being used:
> x <- 1:10
> y <- 1:10
> y2 <- 1:10* 1.1
> plot ( y ~ x, type="n" )
> points( y ~ x, type = "b", col = "red" )  # plot the points and lines
> for the first series
> points( y2 ~ x, type = "b", col = "blue" )  # plot the points and
> lines for the second series
>
> But how should it be done with "coplot"?
>
> If I make my question more concrete:
> df <- data.frame( x=x, y=y, y2=y2, v=c("a","b"))  # using the vectors
> above coplot( df$y~df$x | df$v, type="b", col="red")  # gives me a
> coplot of y ~ x
>
> How do I now put points and lines for y2 on the same graphs?

Don't know about coplot, but with xyplot from the lattice package (which 
one might consider to be a refined version of coplot) you could do:

xyplot(y + y2 ~ x, df, type = 'b', col = c('blue', 'red'))

Deepayan