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Re: Sorting 3 points

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87973] Re: Sorting 3 points
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Mon, 21 Apr 2008 06:38:50 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <fuhfa6$ibk$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

Sort[{P1,P2,P3}, Last[#1]<Last[#2] &]

??

Regards
   Jens


carlos at colorado.edu wrote:
> Simple question, but documentation is no help.
> I have three coordinate triplets:
> 
>  P1={x1,y1,z1}      P2={x2,y2,z2}      P3={x3,y3,z3}
> 
> where all entries are numeric. I wont to sort them into
> 
>  P1s={xs1,ys1,zs1} P2s={xs2,ys2,zs2} P3s={xs3,ys3,zs3}
> 
> so that zs3>=zs2>=zs1, with one command
> 
>    {P1s,P2s,P3s}=Sort[{P1,P2,P3}, Ordering Function]
> 
> Is that possible and if so, which Ordering Function
> should be used?  Thanks.
> 


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