[R] Adding a new column to data frame (recoding)

[Peter Dalgaard BSA]

Aleksey Naumov <naumov at acsu.buffalo.edu> writes:

> How do I add a new column to data - 'var2' in which I group  values in
> 'var1',
> for example:
> 
>   var1 var2
> 1    1    4
> 2    2    4
> 3    3    5
> 
> It's got to be simple, but I can't find it...

data$var2 <- c(4,4,5)[data$var1]

or 

data <- transform(data, var2=c(4,4,5)[var1])

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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