Try this:

#DF <- read.table( )
DF[!as.POSIXlt(DF$V1)[['min']] %% 15,]


On Tue, Aug 17, 2010 at 10:02 AM, skan <juanpide@gmail.com> wrote:

>
> Hello
>
> I have a file with this format
>
> 2005-01-03 09:05      0.00
> 2005-01-03 09:10      0.01
> 2005-01-03 09:15      0.02
> 2005-01-03 09:20      0.03
> 2005-01-03 09:25      0.04
> 2005-01-03 09:30      0.05
> 2005-01-03 09:35      0.06
> 2005-01-03 09:40      0.07
> 2005-01-03 09:45      0.08
> 2005-01-03 09:50      0.09
> 2005-01-03 09:55      0.10
> 2005-01-03 10:00      0.00
> 2005-01-03 10:05      0.00
> ....
> some data may be missing
>
>
> And I need to keep just the rows with time multiple of 15sec
> 2005-01-03 09:15      0.02
> 2005-01-03 09:30      0.05
> 2005-01-03 09:45      0.08
> 2005-01-03 10:00      0.00
> .......
>
>
> How can I do it?
>
> thanks
> --
> View this message in context:
> http://r.789695.n4.nabble.com/remove-rows-tp2328312p2328312.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org mailing list
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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