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Sorting 3 points

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87935] Sorting 3 points
  • From: carlos at Colorado.EDU
  • Date: Mon, 21 Apr 2008 03:21:55 -0400 (EDT)

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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