[R] increase a value by each group?

[Ortiz, John]

Hi Tierry,

Thanks for your answer, that is very close to I'm looking, but
there are this difference:

whit your code I get this:

Depth   s_name  indice  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      54962.04
54962   site_C  27      54962.04
54962   Site_D  217     54962.05
54962   Site_D  217     54962.05
54962   Site_D  217     54962.05
54962   Site_D  217     54962.05


I need that when the depth change, the increase start with   .01 again.
Please cheek in my example the last 8 rows. (attach to the end)

Maybe you have another possible solution?

Thanks  again,

John Ortiz


Depth   s_name  indice  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

________________________________________
From: ONKELINX, Thierry [Thierry.ONKELINX at inbo.be]
Sent: Monday, March 14, 2011 9:59 AM
To: Ortiz, John; r-help at r-project.org
Subject: RE: increase a value by each group?

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.Onkelinx at 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-bounces at r-project.org
> [mailto:r-help-bounces at r-project.org] Namens Ortiz, John
> Verzonden: maandag 14 maart 2011 15:18
> Aan: r-help at 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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