Richard -
Yes, you certainly can use aggregate to acheive what you want:
aggregate(a$hobby,a['name'],paste,collapse=' ')
name x
1 Tom fishing reading
2 Mary reading running
3 John boating
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Thu, 7 Oct 2010, Tan, Richard wrote:
Hi, R function aggregate can only take summary stats functions, can I
aggregate text columns? For example, for the dataframe below,
a <- rbind(data.frame(id=1, name='Tom',
hobby='fishing'),data.frame(id=1, name='Tom',
hobby='reading'),data.frame(id=2, name='Mary',
hobby='reading'),data.frame(id=3, name='John',
hobby='boating'),data.frame(id=2, name='Mary', hobby='running'))
a
id name hobby
1 1 Tom fishing
2 1 Tom reading
3 2 Mary reading
4 3 John boating
5 2 Mary running
I want output as
b
id name hobbies
1 Tom fishing reading
2 Mary reading running
3 John boating
Thanks,
Richard
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