Hi,
I was "losing" my dates in a script and upon inspection, found that my recent
switch from separate "if" and "else" to "ifelse" was the cause. But why?
my.date = as.POSIXct("2011-06-04 08:00:00")
default.date = seq(as.POSIXct("2011-01-01 08:00:00"), as.POSIXct("2011-09-01
08:00:00"), length=15)
x = 4 * 60 * 60
(my.date + x)
(min(default.date) + x)
(new.date = ifelse(!is.na(my.date), my.date + x, min(default.date) + x) )
(if(!is.na(my.date)) new.date2 = my.date + x else new.date2= min(default.date)
+ x )
On my machine, new.date is "numeric" whereas new.date2 is "POSIXct" and
"POSIXt", as desired.
sessionInfo()
R version 2.13.0 (2011-04-13)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
locale:
[1] fr_CA.UTF-8/fr_CA.UTF-8/C/C/fr_CA.UTF-8/fr_CA.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
Thanks in advance,
Denis
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