Thanks Duncan, I'll go back to if and else!
Denis
Le 2011-06-05 à 08:39, Duncan Murdoch a écrit :
> On 11-06-05 8:23 AM, Denis Chabot wrote:
>> 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?
>
> See ?ifelse. The class of the result is the same as the class of the test,
> not the classes of the alternatives. You need to manually attach the class
> again, or use a different construction.
>
> Duncan Murdoch
>
>>
>> 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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>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
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