Collapse data matrix with extra info separated by commas

Mon, Apr 6, 2009 7:38 AM

Hello,

I would like to reshape my data for presentation purposes from something
like this:

data.frame(a=c("A","A","A","A","B","B","B"),b=c(1,1,2,2,1,1,1),c=1:7)

a b c
1 A 1 1
2 A 1 2
3 A 2 3
4 A 2 4
5 B 1 5
6 B 1 6
7 B 1 7

to something like this:
  a b c
1 A 1 1,2
3 A 2 3,4
5 B 1 5,6,7

This seems to be the sort of the thing that the reshape library should
be able to do, but I just can't work out how to do it.

Many thanks

Dan

**************************************************************
Daniel Brewer, Ph.D.

Institute of Cancer Research
Molecular Carcinogenesis
Email: daniel.brewer at icr.ac.uk
**************************************************************

The Institute of Cancer Research: Royal Cancer Hospital, a charitable Company Limited by Guarantee, Registered in England under Company No. 534147 with its Registered Office at 123 Old Brompton Road, London SW7 3RP.

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Collapse data matrix with extra info separated by commas

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