Splitting a data.frame by a variable [duplicate]

by

split seems to be appropriate here.

If you start with the following data frame :

df <- data.frame(ids=c(1,1,2,2,3),x=1:5,y=letters[1:5])

Then you can do :

split(df, df$ids)

And you will get a list of data frames :

R> split(df, df$ids)
$`1`
  ids x y
1   1 1 a
2   1 2 b

$`2`
  ids x y
3   2 3 c
4   2 4 d

$`3`
  ids x y
5   3 5 e

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