On Nov 21, 2014, at 2:55 PM, Raghuraman Ramachandran wrote:
> Sorry I forgot to mention it clearly. I like to round it to the
> nearest 30th minute that is past. So 12:28:59 will be again 12:00:00
> and
> 12:59:59 will be 12:30:00 etc. Apologies for the lack of clarity in
> the beginning.
>
That's just truncation. Should be very easy to hack trunc.POSIXt to deliver
that result. Add a "half_hr" unit to the list and then a simple extra clause
that check for minutes >30.
> base::trunc.POSIXt
function (x, units = c("secs", "mins", "hours", "days"), ...)
{
units <- match.arg(units)
x <- as.POSIXlt(x)
if (length(x$sec))
switch(units, secs = {
x$sec <- trunc(x$sec)
}, mins = {
x$sec[] <- 0
}, hours = {
x$sec[] <- 0
x$min[] <- 0L
}, days = {
x$sec[] <- 0
x$min[] <- 0L
x$hour[] <- 0L
x$isdst[] <- -1L
})
x
}
<bytecode: 0x10a54b038>
<environment: namespace:base>
--
David.
> Many thanks
> Raghu
>
> On Fri, Nov 21, 2014 at 10:52 PM, Raghuraman Ramachandran
> <optionsra...@gmail.com> wrote:
>> Dear guRus
>>
>> How can I round of time in R to the nearest 30th minute please?
>>
>> For example suppose if
>>> Sys.time()
>> [1] "2014-11-21 22:49:05.59042 GMT"
>> then I would like a function that outputs 22:30:00.
>>
>> if Sys.time is 12:13:22 then I would like to get 12:00:00 etc.
>>
>> Any help would be appreciated.
>>
>> Many thanks and regards,
>> Raghu
>
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David Winsemius
Alameda, CA, USA
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