On Nov 7, 2010, at 10:35 PM, rent0...@umn.edu wrote:
Hello. First post, though I have read scores. Mostly i can solve my
problems reading the archives, but I lack the vocabulary to ask this
one right. Any social faux pais, I apologize.
I am sure this is a very basic question and I am embarrassed to ask,
but I spent several hours scouring the archives and trying various
suggestions, but I am too new to get any of them to work.
I am trying to generate an xyplot (or bwplot) for a presentation on
Tuesday. As part of my dissertation I have 3 treatments divided into
2 time periods (before and after treatment).
Code that works (stripped of labels) is:
xyplot(veg$litter_depth ~ veg$status | veg$treatment, layout=c(3,1),
type=c("p","r"))
Status is "before" and "after" In essence I am plotting a change in
litter depth (and about 50 other variables) over time for each of
the treatments. This generates a graph with 3 separate plots, one
for each treatment. The plot works, but after is on the left and
before on the right. This bugs me.
I tried:
veg$status2 <- reorder(veg$status, new.order=
but get:
Error in length(X) : 'X' is missing
To make this leass ambiguous you could have posted str(veg). Try
(perhaps):
veg$status <- factor(vec$status, levels=c(c("before", "after"))
Then plot as before.
--
David.
I also tried:
h <- xyplot(litter.cover ~ status | treatment, relevel(status,
ref=c("before", "after")), data = veg)
but get:
Error in relevel(status, ref = c("before", "after")) : object
'status' not found
I have noticed that folks request data, but I hope my question is
basic enough without it.
Please be gentle and thank you in advance,
Mike.
--
Michael S. Rentz
PhD Candidate, Conservation Biology
David Winsemius, MD
West Hartford, CT
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