[R] xyplot: Plotting two variables, one as points - the other as line. Can that be done without explicitly using panel functions

[Gabor Grothendieck]

If the x values are unique, as in this example, then
xyplot.zoo can do it without a panel function (or
perhaps more accurately the default panel function
in xyplot.zoo can do it).  Note that a zoo object is
a vector or matrix with a time index attached to it.
You don't really have to be familiar with zoo manipulations
for this but there is zoo vignette if you want.

library(lattice)
libary(zoo)
set.seed(1)
d <- data.frame(x=1:10,y=5+1:10, yf=rnorm(10,5+1:10))

z <- with(d, zoo(cbind(y, yf), x)) # create zoo object, x is time
xyplot(z, col = 2:3, type = c("l", "p"), pch = "b", screen = 1)


On 11/1/06, Søren Højsgaard <Soren.Hojsgaard at agrsci.dk> wrote:
> Hi! Consider
> d <- data.frame(x=1:10,y=5+1:10, yf=rnorm(10,5+1:10))
>    x  y        yf
> 1   1  6  5.268621
> 2   2  7  8.623896
> 3   3  8  8.114830
> 4   4  9 10.125955
> 5   5 10  9.977261
> ...
>
> I plot y and yf against x with
>
> xyplot(y+yf~x,data=d,col=c('red','green'),pch=c("a","b"))
>
> BUT - I would like that the plot of y against x is with type='l' and the plot of yf against x is with type='p'.
>
> 1) Can this be done easily (i.e. without panel functions)? (Doing
>
>  xyplot(y+yf~x,data=d,type=c("l","p"),col=c('red','green'),pch=c("a","b"))
>
> is not the way ahead)
>
> 2) How to do it with panel functions?
>
> Thanks in advance
> Søren
>
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