Something like this?
my_data=read.table("clipboard", header=TRUE)
my_data$s_name <- factor(my_data$s_name)
library(plyr)
ddply(my_data, .(s_name), function(x){
x$Im_looking <- x$Depth + as.numeric(x$s_name) / 100
x
})
Best regards,
Thierry
----------------------------------------------------------------------------
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek
team Biometrie & Kwaliteitszorg
Gaverstraat 4
9500 Geraardsbergen
Belgium
Research Institute for Nature and Forest
team Biometrics & Quality Assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
thierry.onkel...@inbo.be
www.inbo.be
To call in the statistician after the experiment is done may be no more than
asking him to perform a post-mortem examination: he may be able to say what the
experiment died of.
~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data.
~ Roger Brinner
The combination of some data and an aching desire for an answer does not ensure
that a reasonable answer can be extracted from a given body of data.
~ John Tukey
> -----Oorspronkelijk bericht-----
> Van: r-help-boun...@r-project.org
> [mailto:r-help-boun...@r-project.org] Namens Ortiz, John
> Verzonden: maandag 14 maart 2011 15:18
> Aan: r-help@r-project.org
> Onderwerp: [R] increase a value by each group?
>
>
> Hi everybody.
>
> I'm looking for the way to increase the depth value in 0.01
> for each index group.
> Easier to explain with this example:
>
>
> >my_data=read.table("clipboard", header=TRUE)
>
> Depth s_name index
> 3852 Site_1 144
> 3852 Site_1 144
> 3852 Site_1 144
> 3852 site_A 145
> 3852 site_A 145
> 3852 site_A 145
> 3852 site_A 145
> 3852 site_B 147
> 3852 site_B 147
> 3852 site_B 147
> 3852 site_B 147
> 54962 site_C 27
> 54962 site_C 27
> 54962 Site_D 217
> 54962 Site_D 217
> 54962 Site_D 217
> 54962 Site_D 217
>
> I'm looking for something like that (four column)
>
> Depth s_name index Im_looking
> 3852 Site_1 144 3852.01
> 3852 Site_1 144 3852.01
> 3852 Site_1 144 3852.01
> 3852 site_A 145 3852.02
> 3852 site_A 145 3852.02
> 3852 site_A 145 3852.02
> 3852 site_A 145 3852.02
> 3852 site_B 147 3852.03
> 3852 site_B 147 3852.03
> 3852 site_B 147 3852.03
> 3852 site_B 147 3852.03
> 54962 site_C 27 54962.01
> 54962 site_C 27 54962.01
> 54962 Site_D 217 54962.02
> 54962 Site_D 217 54962.02
> 54962 Site_D 217 54962.02
> 54962 Site_D 217 54962.02
>
>
> Currently I found the way to increase the depth but not like I need,
>
> tave = my_data$Depth + (ave(my_data$Depth, my_data$index,
> FUN=seq_along))/100
>
> Depth s_name index test
> 3852 Site_1 144 3852.01
> 3852 Site_1 144 3852.02
> 3852 Site_1 144 3852.03
> 3852 site_A 145 3852.01
> 3852 site_A 145 3852.02
> 3852 site_A 145 3852.03
> 3852 site_A 145 3852.04
> 3852 site_B 147 3852.01
> 3852 site_B 147 3852.02
> 3852 site_B 147 3852.03
> 3852 site_B 147 3852.04
> 54962 site_C 27 54962.01
> 54962 site_C 27 54962.02
> 54962 Site_D 217 54962.01
> 54962 Site_D 217 54962.02
> 54962 Site_D 217 54962.03
> 54962 Site_D 217 54962.04
>
>
> I'm looking to increase all index group, not just each element.
>
> Thanks in advance,
>
> John Ortiz
>
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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