[R] Time rather than dates?

[Petr Pikal]

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 at stat.math.ethz.ch
From:           	Robert Lundqvist <Robert.Lundqvist at ltu.se>
Date sent:      	Tue, 30 May 2006 14:16:29 +0200
Subject:        	[R] Time rather than dates?
Send reply to:  	Robert.Lundqvist at ltu.se
	<mailto:r-help-request at stat.math.ethz.ch?subject=unsubscribe>
	<mailto:r-help-request at stat.math.ethz.ch?subject=subscribe>

> 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
> 
> ______________________________________________
> R-help at 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

Petr Pikal
petr.pikal at precheza.cz