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MathGroup Archive 2005

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Re: aggregation of related elements in a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg61610] Re: aggregation of related elements in a list
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Sun, 23 Oct 2005 05:46:33 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

On 10/22/05 at 12:35 AM, leigh at cephb.fr (leigh pascoe) wrote:

>related to x5 but not x7 and x5 is related to x7 etc. would produce
>the list of lists

>{{x1},{x2,x5,x7),.......}

>To take a specific example, assume we have the list

>list={1,2,6,7,8,9,11,16}

>and that application of the relatedQ, test to all possible pairs
>yields the list of related pairs

>prlist={{1,2},{1,6},{2,6},{2,7},{6,7},{6,11},{7,8},{7,11},{11,16}}

>Using the list and the list of related pairs we can deduce the
>desired list of lists as

>{{1,2,6,7,8,11,16},{9}}

Have you looked at the package Statistics`ClusterAnalysis`? It looks to me like this package has the functions you are asking for.
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