Hi,
data are extracted from MS Access with the format: ("%d/%m%Y %H%M%S"); ex:
16/09/2006 03:38:37
I still have error messneger
Thank you for your help.
Lassana KOITA
Chargé d'Etudes de Sécurité Aéroportuaire et d'Analyse Statistique /
Project Engineer Airport Safety Studies & Statistical analysis
Service Technique de l'Aviation Civile (STAC) / Civil Aviation Technical
Department
Direction Générale de l'Aviation Civile (DGAC) / French Civil Aviation
Headquarters
Tel: 01 49 56 80 60
Fax: 01 49 56 82 14
E-mail: [EMAIL PROTECTED]
http://www.stac.aviation-civile.gouv.fr/
Uwe Ligges <[EMAIL PROTECTED]>
12/08/2007 15:24
A
Matthew Walker <[EMAIL PROTECTED]>
cc
Henrique Dallazuanna <[EMAIL PROTECTED]>, r-help@stat.math.ethz.ch, KOITA
Lassana - STAC/ACE <[EMAIL PROTECTED]>
Objet
Re: [R] need help to manipulate function and time interval
Matthew Walker wrote:
> Uwe Ligges wrote:
>> Henrique Dallazuanna wrote:
>>
>>> Hi,
>>>
>>> Try whit:
>>>
>>> if(time[j] >= "18:00:00" & < "23:59:59")
>>>
>>
>> This code is obviously wrong and does not help for the next few lines
>> in the questioner's message, please do not post unsensible stuff.
>>
>> Uwe Ligges
>>
>>
>
> Actually, I would have said that was quite an interesting solution. If
> the time is guaranteed to be in this 8 character format, then that
> idea's quite easily implemented:
>
> # Returns true if time is between 18:00:00 and 23:59:59
> check_time <- function(time_string) {
> if (nchar(time_string)!=8) stop ("Incorrect format")
> time_string >= "18:00:00" & time_string <= "23:59:59"
> }
>
>
> > check_time("19:59:00")
> [1] TRUE
> > check_time("16:59:00")
> [1] FALSE
> >
> > check_time("18:00:00")
> [1] TRUE
> > check_time("23:59:59")
> [1] TRUE
> > check_time("24:00:00")
> [1] FALSE
> >
> > check_time("18:05")
> Error in check_time("18:05") : Incorrect format
>
>
> Perhaps there is an issue if the locale does not sort character-based
> numbers in the same way as ASCII? But Otherwise, I can't see why this
> solution wouldn't do the job.
>
> A more robust solution solution would parse the strings (?strptime) and
> then check their days/hours/mins/seconds (?DateTimeClasses). But
> perhaps the above is sufficient?
Well, the interesting part of the original question that everynody seems
to omit now was the second part:
if (time[j] is between 22:00:00 and 05:59:59)
hence the answer is still not sufficient (even if the syntax error has
been corrected) - and hence I asked for the format the time is
originally in.
Uwe Ligges
> Cheers,
>
> Matthew
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