[R] strptime command in R
Prof Brian Ripley
ripley at stats.ox.ac.uk
Tue Oct 28 21:21:03 CET 2003
It would appear to mean that your `Unix' box's strptime is seriously
broken, but you could profile R (the process, not R profiling) to find
out.
You could try using package chron to convert the strings and then
as.POSIXct, but that's inelegant at best.
On Tue, 28 Oct 2003, morozov wrote:
> Hello all:
>
> I have a column of times in format
>
> x
> "16:30:00"
> "16:30:03"
> "16:59:00"
> etc
>
> which I need to convert into time variables and do some operations on.
>
> I do the command y<-strptime(x,"%H:%M:%S"). This executes almost istantly (for
> a column x of length 1000 in Windows, but in Unix, where I run my production
> jobs, this takes over 4 minutes. I know that generally my Unix box is much
> more powerfull than my Win machine, and R runs generally faster on Unix, but
> this particular command is very very slow. Why is that? How can I speed that
> up without having to parse the strings by hand?
>
> Thank you very much,
> Vlad.
>
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>
--
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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