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From "James Carman" <ja...@carmanconsulting.com>
Subject Re: [Collections] "For each pair" iterator
Date Wed, 02 Apr 2008 16:33:16 GMT
Close, but a power set is the set of *all* subsets, not just the size-2 subsets.

On Wed, Apr 2, 2008 at 12:27 PM, Wes Clark <wclark@guidewire.com> wrote:
> I believe that is called the "power set".
>
>
>
>  -----Original Message-----
>  From: jcarman@carmanconsulting.com [mailto:jcarman@carmanconsulting.com]
>  On Behalf Of James Carman
>  Sent: Wednesday, April 02, 2008 9:26 AM
>  To: Jakarta Commons Users List
>  Subject: Re: [Collections] "For each pair" iterator
>
>  That's more of a combinatorics problem.  Perhaps math would be
>  interested in something like that?
>
>  On Wed, Apr 2, 2008 at 12:20 PM, Pedro Pedruzzi <ppedruzzi@v2com.mobi>
>  wrote:
>  > Hi,
>  >
>  >  What I'd like to do is iterate through each subset of size 2 of a
>  Set.
>  >
>  >  Example:
>  >
>  >  My set is: S = {1,2,3,4}
>  >  I'd like to iterate throught every one of these subsets:
>  >  {1,2}, {1,3}, {1,4}, {2,3}, {2,4} and {3,4}.
>  >
>  >
>  >
>  >  --
>  >  Pedro Pedruzzi |  V2COM | +55 11 3094-3939
>  >
>  >
>  >
>  >
>  > On Mon, Mar 31, 2008 at 11:59 PM, GUPTA GAURAV KUMAR
>  > <Gaurav_Kumar.Gupta@alcatel-lucent.com> wrote:
>  >  > Hi
>  >  >
>  >  >  Please provide more details about your query. Better to give some
>
>  > >  example.
>  >  >
>  >  >  KR
>  >  >  Gaurav Kumar
>  >  >
>  >  >
>  >  >  -----Original Message-----
>  >  >  From: Pedro Pedruzzi [mailto:ppedruzzi@v2com.mobi]  >  Sent:
>  > Tuesday, April 01, 2008 3:56 AM  >  To: user@commons.apache.org  >
>  > Subject: [Collections] "For each pair" iterator  >  >  >  > Hi guys,
>  > >  >  I have a java.util.Set and I'd like to do a iteration like "for
>  > each  >  to distinct pair of elements" do something. In this case I
>  > don't care  >  for the ordering of the pair. A most precise way would
>  > be: "for each  >  subset of size 2" do something.
>  >  >
>  >  >  Do the Apache Commons Collections provide some class to do this?
>  >  >
>  >  >  Thanks in advance,
>  >  >
>  >  >  --
>  >  >  Pedro Pedruzzi | V2COM | +55 11 3094-3939
>  >
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