[R] using perm.cond & index.cond in lattice package
ottorino-luca.pantani at unifi.it
Mon Jul 5 16:57:35 CEST 2004
Dear R users,
this is my first question to the list.
I hope it will be not a trivial one.
My problem is to change the order in which the panel are plotted in a
I've read the S-plus Trellis Graphics user manual, in which there is a
function called "reorder.factor",
that, as far as I can catch from ?xyplot, in the lattice package is
substituted by two others:
"index.cond" & "perm.cond"
here below the (fictitious) data
cbind.data.frame(TREAT=c(rep(c("YES", "NO"), each=12)),
OM=rep(rep(c(5, 1, 3, 7), each=3), 2),
Y=c(rnorm(3, mean=5),rnorm(3, mean=1),rnorm(3,
rnorm(3, mean=6),rnorm(3, mean=2),rnorm(3,
#The panels are plotted in alphabetical order, but I would rather have
# i.e. the panels ordered by OM (Organic Matter) content
#but with LOCATION written in the strip.
#I can see that
# $ index.cond :List of 1
# ..$ : int [1:4] 1 2 3 4
# $ perm.cond : num 1
#so I tried
#and it seems to work, but without the darker tag for OM in the strips.
Now I have one perplexity and one question:
The last "list((1:4)[order(...." works fine, but it seems to me inelegant,
and not practical for plots with
Any suggestion to simplify/improve the matter?
How can I keep the tags in the strips, still ordering the panels by OM?
Thanks in advance.
The following lines are copied from ?xyplot
(I suspect that "order.cond" stands for "index.cond",
since I cannot find it in any other page of the lattice help, nor in the
The order in which the panels are drawn depends on the order
in which the conditioning variables are specified ('g1'
varies fastest). Within a conditioning variable, the order
depends on the order of the levels (which for factors is
usually in alphabetical order). Both of these orders can be
modified using the 'order.cond' and 'perm.cond' arguments,
typically in the 'update' method.
Ottorino-Luca Pantani, Università di Firenze
Dip. Scienza del Suolo e Nutrizione della Pianta
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