R help - Nov 2006 - How can you get N replicates of a multi-screen, multivariate time series plot?

Hello All.

I would like to repeat a multi-screen, multivariate time series plot across
multiple units.

Consider the following data:
 <r-help@stat.math.ethz.ch>     UNIT TRIAL   Y1    Y2      Y3      Y4
Y5      Y6
1    109     1       NA    NA     NA   13718   3655  15240
2    109     2   15000  6000 30000  13057   6198  21962
3    109     3   10000 10000 20000   8356  12929  27992
4    109     4   10000 10000 20000 12642  10978  34843
5    109     5   20000 20000 40000 10335  25754  64060
6    109     6   20000 20000 40000   4591  23706  30256
7    109     7   20000 20000 40000   5743  29107  43887
8    109     8    2000 20000 22000    7800  17717  35294

I want to structure this graph to present 3 screens that each represent 2
time series over TRIAL.  The following code gives me just what I'm looking
for.

library(zoo)
library(lattice)
z <- zoo(data.matrix(ii_df[,3:8]), ii_df[,2])
xyplot(z, screens = c(1, 2, 3, 1, 2, 3), col = 1:6, pch = 1:6, type =
"b")

This works great.  Now, I'd like to repeat this basic graph for 100 levels
of UNIT.  I have two questions.

First, I've tried to replicate this method using a trellis graph without
much success.  Is there a way to replicate this plot across UNITS using a
trellis graph?

Second, the trellis graphs I have been able to make result in plots that are
too small to read.  How could I loop this graphing routine to yield the
graph I get above in my zoo code for each of the 100 distinct units?

Thanks in advance,

Rick

-- 
Rick DeShon
306 Psychology Building
Department of Psychology
Michigan State University
East Lansing, MI 48824-1116

"Prediction is very difficult, especially if it's about the
future."  --Nils
Bohr,

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