Tena koe Anna
The following appears to do what you want (anna is a dataframe
containing the data you provided):
anna$Test <- anna$Signals
anna[duplicated(paste(anna$Dates, anna$Signals)),'Test'] <- 0
anna
Dates Signals Filtered.Signal Test
1 02-11-06 0 0 0
2 02-11-06 1 1 1
3 02-11-06 0 0 0
4 02-11-06 1 0 0
5 02-11-06 1 0 0
6 02-11-06 0 0 0
7 03-11-06 1 1 1
8 03-11-06 1 0 0
9 03-11-06 0 0 0
10 03-11-06 1 0 0
11 03-11-06 0 0 0
HTH ....
Peter Alspach
> -----Original Message-----
> From: r-help-boun...@r-project.org
> [mailto:r-help-boun...@r-project.org] On Behalf Of anna
> Sent: Thursday, 4 March 2010 8:20 a.m.
> To: r-help@r-project.org
> Subject: [R] filtering signals per day
>
>
> Hello R lovers,
> I have a vector of dates and signals. I want to filter the
> signals per day in a way that only the first signal of the
> day remains like this:
> Dates Signals Filtered Signal
> 2006-11-02 0 0
> 2006-11-02 1 1
> 2006-11-02 0 0
> 2006-11-02 1 0
> 2006-11-02 1 0
> 2006-11-02 0 0
> 2006-11-03 1 1
> 2006-11-03 1 0
> 2006-11-03 0 0
> 2006-11-03 1 0
> 2006-11-03 0 0
>
> The thing is that I want to do it with matrix functions and
> not doing a loop but I still have no clue even after having
> spent time on it. Can somebody please help me? thank you!
>
>
>
> -----
> Anna Lippel
> --
> View this message in context:
> http://n4.nabble.com/filtering-signals-per-day-tp1577044p1577044.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
>
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