[R] Finding all possible partitions of N units into k classes

[Ingmar Visser]

combinations in the gtools package can be helpfull here,
best, ingmar

> From: "Ales Ziberna" <aleszib at gmail.com>
> Date: Thu, 8 Dec 2005 15:45:37 +0100
> To: "R-help" <r-help at stat.math.ethz.ch>
> Subject: [R] Finding all possible partitions of N units into k classes
> 
> Dear useRs!
> 
> 
> 
> I would like to generate a list of all possible (unique) partitions of N
> units into k classes. For example, all possible partitions of 4 units into 2
> classes are (I hope I have not missed anyone):
> 
> 1,1,1,2 (this can be read as {1,2,3},{4})
> 
> 1,1,2,1
> 
> 1,2,1,1
> 
> 2,1,1,1
> 
> 1,1,2,2
> 
> 1,2,1,2
> 
> 1,2,2,1
> 
> 
> 
> The partitions 1,1,2,2 and 2,2,1,1 are the same and are therefore not two
> unique partitions.
> 
> 
> 
> Thank you in advance for any suggestions.
> 
> Best,
> 
> Ales Ziberna
> 
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