Have you looked at the chron package? It has a trunc.times function:
??"times" # would have shown this to you
And the help page appears to provide exactly what was requested.
---------puzzlement follows--------
I did get somewhat unexpected results when I applied what seems to be
the obvious modification to the first example on the chron function
help page:
> x <- chron(dates = dts, times = tms, format= c(dates = "m/d/y",
times = "h:m") )
> x
[1] (02/27/92 2303) (02/27/92 2229) (01/14/92 0103) (02/28/92 1821)
(02/01/92 1656)
Notice that the semicolon is missing. It's not missing when I use a
full "h:m:s"
> x <- chron(dates = dts, times = tms, format= c(dates = "m/d/y",
times = "h:m:s") )
> x
[1] (02/27/92 23:03:20) (02/27/92 22:29:56) (01/14/92 01:03:30)
(02/28/92 18:21:03)
[5] (02/01/92 16:56:26)
But it comes back with "h:m:"
> x <- chron(dates = dts, times = tms, format= c(dates = "m/d/y",
times = "h:m:") )
> x
[1] (02/27/92 23:03:) (02/27/92 22:29:) (01/14/92 01:03:) (02/28/92
18:21:) (02/01/92 16:56:)
--
David
On Jul 16, 2009, at 3:25 PM, Jason Rupert wrote:
Not sure if there is an R way to do this or a regular express way,
but here is what I am trying to do.
I've got lots of data where the format is HH:MM:SS, but I need to
format it like HH:MM:00, i.e. round the second down to zero.
What is the best way to do this?
Thanks again.
Jason
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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