Dirk Eddelbuettel a �crit :
On 9 February 2005 at 14:37, Denham Robert wrote:
| I am a bit confused about how to get the format of the labels in xyplot
| to show as dates rather than the numeric value.
|
| e.g.,
|
| x <- as.Date(c("20/01/2001","20/02/2003","21/06/2004"),"%d/%m/%Y")
| y <- c(1,2,3)
|
| plot(y~x) #produces formatted labels
|
| xyplot(y~x) #doesn't give formatted x labels
|
| xyplot(y~x,scales=list(x=list(format="%d/%m/%Y"))) #still doesn't.
|
| How do I get the format for the xlabels ?
You need another as.POSIXct():
x <- as.POSIXct(as.Date(c("20/01/2001","20/02/2003","21/06/2004"),"%d/%m/%Y"))
y <- c(1,2,3)
xyplot(y~x)
Dirk
Does not work for me (R 2.0.1, Windows, current version of lattice).
The following does:
x <- as.Date(c("20/01/2001", "20/02/2003", "21/06/2004"), "%d/%m/%Y")
y <- c(1,2,3)
library(lattice)
AT <- pretty(x)
LAB <- as.Date("1970-01-01") + AT
xyplot(y ~ x,
scales = list(x = list(at = AT, labels = format(LAB, "%d/%m/%Y"))))
Best,
Renaud
--
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