Hi Richard
If you cannot get a better suggestion this example from Deepayan Sarkar may
help.
It is way back in the archives and I do not have a reference for it.
I have used it about a year ago as a template to do a complicated key
fl <- grid.layout(nrow = 2, ncol = 6,
heights = unit(rep(1, 2), "lines"),
widths = unit(c(2, 1, 2, 1, 2, 1),
c("cm","strwidth","cm","strwidth","cm","strwidth"),
data = list(NULL,"John",NULL,"George",NULL,"The
Beatles")))
foo <- frameGrob(layout = fl)
foo <- placeGrob(foo,
pointsGrob(.5, .5, pch=19,
gp = gpar(col="red", cex=0.5)),
row = 1, col = 1)
foo <- placeGrob(foo,
linesGrob(c(0.2, 0.8), c(.5, .5),
gp = gpar(col="blue")),
row = 2, col = 1)
foo <- placeGrob(foo,
linesGrob(c(0.2, 0.8), c(.5, .5),
gp = gpar(col="green")),
row = 1, col = 3)
foo <- placeGrob(foo,
linesGrob(c(0.2, 0.8), c(.5, .5),
gp = gpar(col="orange")),
row = 2, col = 3)
foo <- placeGrob(foo,
rectGrob(width = 0.6,
gp = gpar(col="#FFFFCC",
fill = "#FFFFCC")),
row = 1, col = 5)
foo <- placeGrob(foo,
textGrob(lab = "John"),
row = 1, col = 2)
foo <- placeGrob(foo,
textGrob(lab = "Paul"),
row = 2, col = 2)
foo <- placeGrob(foo,
textGrob(lab = "George"),
row = 1, col = 4)
foo <- placeGrob(foo,
textGrob(lab = "Ringo"),
row = 2, col = 4)
foo <- placeGrob(foo,
textGrob(lab = "The Beatles"),
row = 1, col = 6)
xyplot(1 ~ 1, legend = list(top = list(fun = foo)))
In my case I changed "strwidth" to "cm" for the text as I was cramped for
space
HTH
Duncan
Duncan Mackay
Department of Agronomy and Soil Science
University of New England
Armidale NSW 2351
Email: home: mac...@northnet.com.au
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Richard Kwock
Sent: Friday, 1 November 2013 06:42
To: R help
Subject: [R] Lattice Legend/Key by row instead of by column
Hi All,
I am having some trouble getting lattice to display the legend names by row
instead of by column (default).
Example:
library(lattice)
set.seed(456846)
data <- matrix(c(1:10) + runif(50), ncol = 5, nrow = 10) dataset <-
data.frame(data = as.vector(data), group = rep(1:5, each = 10), time = 1:10)
xyplot(data ~ time, group = group, dataset, t = "l",
key = list(text = list(paste("group", unique(dataset$group)) ),
lines = list(col = trellis.par.get()$superpose.symbol$col[1:5]),
columns = 4
)
)
What I'm hoping for are 4 columns in the legend, like this:
Legend row 1: "group 1", "group 2", "group 3", "group 4"
Legend row 2: "group 5"
However, I'm getting:
Legend row 1: "group 1", "group 3", "group 5"
Legend row 2: "group 2", "group 4"
I can see how this might work if I include blanks/NULLs in the legend as
placeholders, but that might get messy in data sets with many groups.
Any ideas on how to get around this?
Thanks,
Richard
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