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Finding all n-partitions of a set

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98707] Finding all n-partitions of a set
  • From: "Joe.Mapasapam" <mapasapam at gmail.com>
  • Date: Thu, 16 Apr 2009 04:18:52 -0400 (EDT)

Please how can I find all n-partions of a set ?


Say, i want partitions of the set (no order) {a,a,b,b} into 2,

so we have 
{
{{a,a,b,},{b}},
{{a,b,b},{a}},
{{a,a},{b,b}},
{{a,b},{a,b}}
}

is there already a built in function in mathematica ?

i need so n can be any number


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