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MathGroup Archive 2004

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Re: Sort by buried element in list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg48915] Re: [mg48899] Sort by buried element in list
  • From: DrBob <drbob at bigfoot.com>
  • Date: Wed, 23 Jun 2004 02:51:11 -0400 (EDT)
  • Organization: Deep Space Engineering Corps
  • References: <200406220932.FAA10308@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

data={{{{65,98},{44,66},{48,69},{12,54},{98,59},{33,75}},{065794,{0,1,0,
             1,0,2}}},
{{{12,84},{04,79},{92,52},{01,71},{49,80},{96,44}},{205347,{0,3,2,2,2,3}}},
{{{83,81},{52,77},{17,29},{33,13},{49,10},{78,78}},{000000,{0,0,0,0,0,0}}},
{{{38,25},{74,97},{18,32},{02,08},{43,71},{04,27}},{004354,{0,0,1,1,0,2}}}};

key[{a_List,b_List}]:=First@b

data[[Ordering[key/@data]]]

{{{{83,81},{52,77},{17,29},{33,13},{49,10},{78,78}},{
       0,{0,0,0,0,0,0}}},{{{38,25},{74,97},{18,32},{2,8},{
     43,71},{4,27}},{4354,{0,0,1,
         1,0,2}}},{{{65,98},{44,66},{48,69},{12,54},{98,59},{33,75}},{
       65794,{0,1,0,1,0,2}}},{{{12,
       84},{4,79},{92,52},{1,71},{49,80},{96,44}},{205347,{0,3,2,2,2,3}}}}

Bobby

On Tue, 22 Jun 2004 05:32:12 -0400 (EDT), Steve Gray <stevebg at adelphia.net> wrote:

> 	What's the best way to sort a multilevel list of the following
> type, using as the key the entries 065794, 205347, 000000, 004354,
> etc.? Of course I need all sublists sorted with the key. The entire
> list may be several thousand entries long. Speed is not much of a
> concern. The entries are computed one at a time, and the sort could be
> done at that time or all at once later. I need to (optionally) remove
> entries with duplicate keys, regardless of the other items in the
> entry. The position of the key is known beforehand (obviously).
>
> {{65,98},{44,66},{48,69},{12,54},{98,59},{33,75}},{065794,{0,1,0,1,0,2}}
> {{12,84},(04,79},{92,52},{01,71},{49,80},{96,44}},{205347,{0,3,2,2,2,3}}
> {{83,81},{52,77},{17,29},{33,13},{49,10},{78,78}},{000000,{0,0,0,0,0,0}}
> {{38,25},{74,97},{18,32},{02,08},{43,71},{04,27}},{004354,{0,0,1,1,0,2}}
>
> 	The final result for this small sample would be
>
> {{83,81},{52,77},{17,29},{33,13},{49,10},{78,78}},{000000,{0,0,0,0,0,0}}
> {{38,25},{74,97},{18,32},{02,08},{43,71},{04,27}},{004354,{0,0,1,1,0,2}}
> {{65,98},{44,66},{48,69},{12,54},{98,59},{33,75}},{065794,{0,1,0,1,0,2}}
> {{12,84},(04,79},{92,52},{01,71},{49,80},{96,44}},{205347,{0,3,2,2,2,3}}
>
> 	Thanks for any info.
>
> Steve Gray
>
>
>



-- 
DrBob at bigfoot.com
www.eclecticdreams.net/index.html


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