Re: [R] Time rather than dates?

From: Petr Pikal <petr.pikal_at_precheza.cz>
Date: Tue 30 May 2006 - 22:34:51 EST


Hi

Which version of R do you use?
Version 2.3.1 beta (2006-05-23 r38179)

> treatment_time<-c("01:02:03","02:03:04")
> strptime(treatment_time,format="%H:%M:%S")
[1] "2006-05-30 01:02:03" "2006-05-30 02:03:04"
> ttt<-strptime(treatment_time,format="%H:%M:%S")

For changing format of POSIX variables use format
> format(ttt, "%H:%M")

[1] "01:02" "02:03"

Maybe also consult locale setting.

HTH
Petr

On 30 May 2006 at 14:16, Robert Lundqvist wrote:

To:             	r-help@stat.math.ethz.ch
From:           	Robert Lundqvist <Robert.Lundqvist@ltu.se>
Date sent:      	Tue, 30 May 2006 14:16:29 +0200
Subject:        	[R] Time rather than dates?
Send reply to:  	Robert.Lundqvist@ltu.se
	<mailto:r-help-request@stat.math.ethz.ch?subject=unsubscribe>
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> Using strptime() and other functions for dates has been very helpful
> with the kind of data I often work with. However, I haven't found out
> how time as such should be specified. All my attempts result in time
> *and* date:
>
> >treatment_time<-c("01:02:03","02:03:04") # hours:minutes:seconds
> >time.2<-strptime(treatment_time,format="%H:%M:%S")
>
> >time.2
> [1] "1900-01-01 01:02:03" "1900-01-01 02:03:04"
>
> Why the 1900-...? I had hoped for some easy conversion from time to
> numeric data and possibly back. Assistance would be appreciated.
>
> Robert
>
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Petr Pikal
petr.pikal@precheza.cz



R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue May 30 22:39:19 2006

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