[R] Division of data frame and deletion of values from column

[John Kane]

?subset
?split

--- On Fri, 10/16/09, Joel Fürstenberg-Hägg <joel_furstenberg_hagg at hotmail.com> wrote:

> From: Joel Fürstenberg-Hägg <joel_furstenberg_hagg at hotmail.com>
> Subject: [R] Division of data frame and deletion of values from column
> To: r-help at r-project.org
> Received: Friday, October 16, 2009, 12:16 PM
> 
> Hi all,
> 
> I guess this might be an easy question, but I've searched
> multiple help pages without finding any answear... so now I
> put my trust in you!
> 
> I have a data frame (36 variables and 556 observations).
> One column contains  three factors, and I would like to
> divide the data frame into three new ones, based on the
> value of the factors, thereby having only one value for all
> elements of the particular column in each of the data
> frames. The reason is that I later will create plots and do
> statistical analyzes on these data frames, and I don't want
> those factors affecting the result.
>     ID Weight  Age_days ...
> 1   18   76.1   
>    106
> 2   19   77.0   
>    175  
> 3   20   78.1   
>    121
> 4   21   78.2   
>    121
> 5   22   78.8   
>    106
> 6   23   76.3   
>    106
> .
> .
> .
> 
> I also have another column containing several factors, of
> which I would like to exclude one (get NA instead).
> 
>     ID Weight  Age_days  Value_ID ...
> 1   18   76.1   
>    106      high
> 2   19   77.0   
>    175       low
> 3   20   78.1   
>    121    middle
> 4   21   78.2   
>    121      high
> 5   22   78.8   
>    106      high
> 6   23   76.3   
>    106   
> number   <-- exclude
> 7   24   76.9   
>    175       low
> .
> .
> .
> 
> I really hope someone could help me, though you might think
> it's too easy...
> 
> Best regards,
> 
> Joel
>     
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>           
>   
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