Re: [R] Microseconds for a zoo object?

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Thu, 08 May 2008 15:11:26 +0100 (BST)

I don't see microseconds here, only milliseconds. See ?strptime for how to handle this via %OS.

On Thu, 8 May 2008, Creighton, Sean wrote:

> Hello
>
> I have a string which contains microseconds, can anyone help on
> constructing this in to a time object, with the microseconds, that I can
> take to a ZOO file?
>
> Thanks

> Sean
>
>
>
>> UK[1,3]
> [1] "17:09:53.824"
>> UK[1,1]
> [1] "2007-12-11 00:00:00"
>> mydates <- paste( substr(UK[,1], 1, 10), UK[,3])
>> mydates[1]
> [1] "2007-12-11 17:09:53.824"
>> is(mydates)
> [1] "character" "vector"
>> dt1 <- as.POSIXct(strptime(as.character(mydates),"%Y-%m-%d
> %H:%M:%S",tz="GMT"))
>> dt1[1]
> [1] "2007-12-11 17:09:53 GMT"
Try

> mydates <- "2007-12-11 17:09:53.824"
> as.POSIXct(strptime(mydates,"%Y-%m-%d %H:%M:%S",tz="GMT"))
[1] "2007-12-11 17:09:53 GMT"
> op <- options(digits.secs=3)
> as.POSIXct(strptime(mydates,"%Y-%m-%d %H:%M:%OS",tz="GMT"))
[1] "2007-12-11 17:09:53.824 GMT"
> options(op)

See ?Sys.time for a similar example.

-- 
Brian D. Ripley,                  ripley_at_stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Thu 08 May 2008 - 14:19:28 GMT

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