Hi all,
Another one:
Given a data frame with two columns, where the first column (let's
call it 'id') has redundant entries, I'd like to get, for each unique
value in 'id', a list or vector of all the values from the second
column that corresponded to that value.
Example:
> df <- data.frame('id'=c('a','b','a','c','b','a'),'value'=c(6,4,2,9,1,7))
> df
id value
1 a 6
2 b 4
3 a 6
4 c 9
5 b 1
6 a 7
I'd like some kind of output resembling something along these lines:
a: 6, 6, 7
b: 4, 1
c: 9
Any ideas would be appreciated!
Best,
Jonathan
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
