Dear all,
given the following data
## original data
id <- c(1,1,1,2,2,3)
author <- c("A","B","C","D","E","F")
tmp <- data.frame(id,author)
tmp
> tmp
id author
1 1 A
2 1 B
3 1 C
4 2 D
5 2 E
6 3 F
What is the best (most efficient/vectorized/avoiding loops) approach to
obtain the following data frame?
id author
1 "A, B, C"
2 "D, E"
3 "F"
Thanks for your help,
Bernd
> version
_
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status Patched
major 2
minor 8.1
year 2008
month 12
day 22
svn rev 47296
language R
version.string R version 2.8.1 Patched (2008-12-22 r47296)
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