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