On Nov 21, 2010, at 3:52 PM, Dimitri Shvorob wrote:
Can someone please fix this snippet? (i.e. append to the dataframe a
column
containing "truncated" time value)?
df = structure(list(t = structure(c(1033963406.044, 1033974144.847,
1033988418.836), class = c("POSIXt", "POSIXct"))), .Names = "t",
row.names =
c(NA,
3L), class = "data.frame")
> df
t
1 2002-10-07 00:03:26
2 2002-10-07 03:02:24
3 2002-10-07 07:00:18
> df$dt <- as.Date(df$t)
> df
t dt
1 2002-10-07 00:03:26 2002-10-07
2 2002-10-07 03:02:24 2002-10-07
3 2002-10-07 07:00:18 2002-10-07
# Try 1
df$day = trunc.POSIXt(as.POSIXlt(df$t, origin = "1970-01-01"),
units =
"day")
Error in `$<-.data.frame`(`*tmp*`, "day", value = list(0, 0L, 0L,
7L, :
replacement has 9 rows, data has 3
# Try 2
f = function(t) trunc.POSIXt(as.POSIXlt(t, origin = "1970-01-01"),
units =
"day")
df$day = sapply(df$t, f)
Error in `$<-.data.frame`(`*tmp*`, "day", value = list(sec = 0, min
= 0L, :
replacement has 9 rows, data has 3
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