[R] exaustive subgrouping or combination

[David Duffy]

On Fri, 29 Jun 2007, Peter Dalgaard wrote:

> David Duffy wrote:
>>> Waverley <waverley.paloalto at gmail.com> asked:
>>> 
>>> Dear Colleagues,
>>> 
>>> I am looking for a package or previous implemented R to subgroup and
>>> exaustively divide a vector of squence into 2 groups.
>>> 
>>> -- 
>>> Waverley @ Palo Alto
>>> 
>> 
>> Google "[R] Generating all possible partitions" and you will find some R 
>> code
>> from 2002 or so.
>>
>> 
> In 2002 this wasn't already in R. These days, help(combn) is more to the 
> point:
>
> mn <- sort(zapsmall(combn(sleep$extra,10,mean)))
> plot(unique(mn),table(mn))
> abline(v=mean(sleep$extra[1:10]))
>

As I read it, the original query is about partitioning the set eg
((1 2) 3) ((1 3) 2) (1 (2 3)).

-- 
| David Duffy (MBBS PhD)                                         ,-_|\
| email: davidD at qimr.edu.au  ph: INT+61+7+3362-0217 fax: -0101  /     *
| Epidemiology Unit, Queensland Institute of Medical Research   \_,-._/
| 300 Herston Rd, Brisbane, Queensland 4029, Australia  GPG 4D0B994A v