R help - Aug 2006 - lattice/xyplot: plotting 4 variables in two panels - can this be done?

Hi,
I would like to create a plot of y1,y2,y3,y4 against x for several subjects such
that y1 and y2 are plotted against x in one panel and y3 and y4 against x in
another panel. Thus if there are 3 subjects I should end up with 6 panels. Is
there a simple way of doing so (i.e. without calling xyplot() several times, and
then padding the results together)??
Regards
S?ren

On 8/29/06, S?ren H?jsgaard <Soren.Hojsgaard at agrsci.dk>
wrote:
> Hi,
> I would like to create a plot of y1,y2,y3,y4 against x for several subjects
such that y1 and y2 are plotted against x in one panel and y3 and y4 against x
in another panel. Thus if there are 3 subjects I should end up with 6 panels. Is
there a simple way of doing so (i.e. without calling xyplot() several times, and
then padding the results together)??

You need to transform your data into a suitable form. See ?reshape and
?make.groups.

Deepayan

Try xyplot.zoo in the zoo package (be sure you have
the latest zoo version). One caveat is that xyplot.zoo is
under development and could change.  Here we use the
builtin data set anscombe as an example:

# display the anscombe data set
anscombe

library(lattice)
library(zoo)
# create zoo object using column 1 as x/times and columns 5:8 as the y's
z <- zoo(data.matrix(anscombe[,5:8]), anscombe[,1])
xyplot(z, screens = c(1, 1, 2, 2), col = 1:4, pch = 1:4, type = "b")


On 8/29/06, S?ren H?jsgaard <Soren.Hojsgaard at agrsci.dk>
wrote:
> Hi,
> I would like to create a plot of y1,y2,y3,y4 against x for several subjects
such that y1 and y2 are plotted against x in one panel and y3 and y4 against x
in another panel. Thus if there are 3 subjects I should end up with 6 panels. Is
there a simple way of doing so (i.e. without calling xyplot() several times, and
then padding the results together)??
> Regards
> S?ren
>
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