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MathGroup Archive 2004

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Re: sort procedure

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52495] Re: sort procedure
  • From: Peter Pein <petsie at arcor.de>
  • Date: Tue, 30 Nov 2004 05:23:57 -0500 (EST)
  • References: <coefho$rei$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

paolo wrote:
> If I have a data serie of n paired observations (x_t,x_t-1) ordered according to time, how can i re-order this serie according to the size of x_t-1
> 
> The procedure Sort it seems it does not work well.
> anyone has suggestions?
> thanks
> 
> P.
> 
> 
> 
> ____________________________________________________________
> Libero ADSL: navighi gratis a 1.2 Mega, senza canone e costi di attivazione. 
> Abbonati subito su http://www.libero.it 
> 
> 
Have a look at the documentation ("Sort"):

In[1]:=
   data = Array[{#, Random[]} &, {10}]
Out[1]=
   {{1, 0.380212}, {2, 0.426241}, {3, 0.669725}, {4, 0.383463},
    {5, 0.113896}, {6, 0.315838}, {7, 0.660724}, {8, 0.641325},
    {9, 0.902577},{10, 0.891397}}
In[2]:=
   Sort[data, (Less @@ Last /@ {#1, #2}) &]
Out[2]=
   {{5, 0.113896}, {6, 0.315838}, {1, 0.380212}, {4, 0.383463},
    {2, 0.426241}, {8, 0.641325}, {7, 0.660724}, {3, 0.669725},
   {10, 0.891397}, {9, 0.902577}}

-- 
Peter Pein
10245 Berlin


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