R help - May 2006 - Help with adding minutes to time

Dear R Helpers,

I need to read time from a .csv file which is formated as chartime
(09:12:00) below. I need to add one minute (cf chartime2).
Then I need to output the value just as 09:13 without the seconds for
writing a csv file and input in another program.

I get it with the following reproducible example but I can't help
thinking that there must a less clumsy way to do that ! 

Thanks for any input and eventually a pointer to an example of how to
add minutes or seconds to a time without a date which I think makes
POSIX not relevant in this case.

Best regards, Jean-louis

 
library(chron)
chartime<-"09:12:00"
chartime2<-"00:01:00"
chrontime<-times(chartime)
chrontime2<-times(chartime2)
test<-chrontime+chrontime2
test<-as.character(test)
test<-sub(":00","",test)

"Jean-Louis Abitbol" <abitbol at sent.com> wrote:
> Dear R Helpers,
> I need to read time from a .csv file which is formated as chartime
> (09:12:00) below. I need to add one minute (cf chartime2).
> Then I need to output the value just as 09:13 without the seconds for
> writing a csv file and input in another program.
[...]

The numeric representation of chron objects is expressed in day units, and
there are sensible arithmetic methods:

chrontime <- times("09:12:00") + 1/24/60

and then:

paste(hours(chrontime), minutes(chrontime), sep=":")


Cheers,

-- 
Seb

Try this:
> hhmm <- function(x) sub(":..$", "",
format(times(x)))
> y <- times("01:02:00", out.format = hhmm) +
times("00:01:00")
> y  # or format(y)
[1] 01:03

or
> # hhmm is from above
> x <- times("01:02:00")
> hhmm(x + times("00:01:00"))
[1] "01:03"

On 5/30/06, Jean-Louis Abitbol <abitbol at sent.com>
wrote:
> Dear R Helpers,
>
> I need to read time from a .csv file which is formated as chartime
> (09:12:00) below. I need to add one minute (cf chartime2).
> Then I need to output the value just as 09:13 without the seconds for
> writing a csv file and input in another program.
>
> I get it with the following reproducible example but I can't help
> thinking that there must a less clumsy way to do that !
>
> Thanks for any input and eventually a pointer to an example of how to
> add minutes or seconds to a time without a date which I think makes
> POSIX not relevant in this case.
>
> Best regards, Jean-louis
>
>
> library(chron)
> chartime<-"09:12:00"
> chartime2<-"00:01:00"
> chrontime<-times(chartime)
> chrontime2<-times(chartime2)
> test<-chrontime+chrontime2
> test<-as.character(test)
> test<-sub(":00","",test)
>
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