| To: | s-news@lists.biostat.wustl.edu |
|---|---|
| Subject: | trellis plots question |
| From: | Dave Evens <devens8765@yahoo.com> |
| Date: | Sun, 11 Mar 2007 08:28:11 -0700 (PDT) |
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Dear members,
I would like to produce a multi-histogram plot of some
data such that each sub-plot has a mark in the heading
bar to represent the mean,
For example, I have the following data
>x <- matrix(c(runif(15), sample(4, 15, T)), 15)
plot the data
>histogram(~x[,1]|as.factor(x[,2]), layout=c(2,2))
and the means are
>tapply(x[,1], x[,2], mean)
1 2 3 4
0.6384744 0.677662 0.5630317 0.5473149
I want to put this mean data into each sub-plot such
that the top (heading) panel has a mark in the correct
position on the x-axis to represent the mean. Is this
possible?
Many thanks in advance for your help.
Regards,
Dave
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