On 2011-04-25 13:07, Hadley Wickham wrote:
If you need plyr for other tasks you ought to use a different
class for your date data (or wait until plyr can deal with
POSIXlt objects).
How do you get POSIXlt objects into a data frame?
df<- data.frame(x = as.POSIXlt(as.Date(c("2008-01-01"))))
str(df)
'data.frame': 1 obs. of 1 variable:
$ x: POSIXct, format: "2008-01-01"
df<- data.frame(x = I(as.POSIXlt(as.Date(c("2008-01-01")))))
str(df)
'data.frame': 1 obs. of 1 variable:
$ x: AsIs, format: "0"
Hadley
To mimic the OP's code
df <- data.frame(x = "2008-01-01")
df$x <- as.POSIXlt(df$x, "%Y-%m-%d")
str(df)
#'data.frame': 1 obs. of 1 variable:
# $ x: POSIXlt, format: "2008-01-01"
Peter Ehlers
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