I'm not exactly sure what structure df has. Here's my effort to
duplicate it:
df <- data.frame(y=matrix(rnorm(24), nrow=6), x=1:6)
> df
y.1 y.2 y.3 y.4 x
1 0.1734636 0.2348417 -1.2375648 -1.3246439 1
2 1.9551669 -1.1027262 -0.7307332 0.3953752 2
3 -0.7645778 1.6297861 0.4743805 -0.4476145 3
4 -0.5308756 -0.5246534 -0.3854609 -1.6097777 4
5 0.7406525 -0.8691720 -0.8194084 1.6122059 5
6 -0.9625619 -1.0774165 1.0760829 0.3659436 6
And this seems to accomplish the desired task. Presumably you have
assigned off-stage the value of title to a meaningful character string?
> p <- xyplot(y.1+y.2+y.3+y.4 ~ x |1:4, data = df, main =
"title" ,layout=c(1,4) )
> p
On Sep 5, 2009, at 11:52 PM, Bryan Hanson wrote:
Hello R Folks...
I have a list with the following structure:
str(df)
List of 3
$ y : num [1:4, 1:1242] -0.005379 0.029874 -0.023274 0.000655
-0.004537
..
$ x : num [1:1242] 501 503 505 507 509 ...
$ names: Factor w/ 4 levels "PC Loading 1",..: 1 2 3 4
I want to plot each row of df$y against df$x, and have each plot in
it’s own
panel according to the levels of df$names. The following works in
the sense
that the layout is right, but the y values have clearly been
recycled or
skipped in some fashion (and an error is thrown for each panel that
the
length of x and y aren’t the same):
p <- xyplot(y ~ x | names, data = df, main = title,
layout = c(1, dim(y)[1])
In reviewing the extended formula interface in the Lattice Book,
what I want
to happen is y1 + y2 + y3 + y4 ~ x | names, outer = TRUE
I see two options: figure out a way to create the extended formula
on the
fly (and the actual number of rows in y may vary), which seems
potentially
tricky, or create a data frame by stacking each row of y and
repeating x and
names to match. This seems like a waste of memory.
I’ve looked through the archives and haven’t come across something
quite
like this, or at least I don’t recognize it if I have! Is there a
more
elegant way to tell xyplot I want to use each row of y repeatedly
with the
same x, in a loop-like fashion?
TIA. Bryan
*************
Bryan Hanson
Professor of Chemistry & Biochemistry
DePauw University, Greencastle IN USA
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