[R] Find the three best values in every row

Patrick Hausmann patrick.hausmann at uni-bremen.de
Fri May 7 18:23:57 CEST 2010

Hello Alfred,

I found the solution from S. Ellison
(https://stat.ethz.ch/pipermail/r-help/2010-May/238158.html) really 
Here I am using tail and the library 'plyr':

  d<-data.frame(africa=sample(50, 10),
  		europe= sample(50, 10),
  		n.america= sample(50, 10),
  		s.america= sample(50, 10),
  		antarctica= sample((1:50)/20, 10)

# using tail
t(apply(d, 1, function(x, n) tail(sort(x), n), n=3))

lapply(split(d, rownames(d)), function(x, n) sort(x)[n:ncol(x)], n=3)

# with plyr from Hadley Wickham
ldply(split(d, rownames(d)), function(x, n) sort(x)[n : ncol(x)], n=3)


Am 07.05.2010 15:43, schrieb Alfred Schulze:
>     Hello,
>     i have a dataframe with the GDP for different Country (in the columns) and
>     Years (in the rows).
>     Now i want for every year the best three values, if possible with name of
>     the countries (columnnames).
>     For the best it's no problem but for the other two values.
>     Thanks,
>     Alfred
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