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MathGroup Archive 2007

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Re: Deleting duplicates from a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76000] Re: [mg75940] Deleting duplicates from a list
  • From: Adriano Pascoletti <adriano.pascoletti at dimi.uniud.it>
  • Date: Mon, 14 May 2007 05:48:32 -0400 (EDT)
  • References: <200705140725.DAA22641@smc.vnet.net>

This is the unsorted union problem, which can be efficiently solved  
using Sow and Reap (see Help Browser > Reap > Further Examples)

In[8]:=UnsortedUnion[x_] := Reap[Sow[1, x], _, #1 & ][[2]]

In[9]:=UnsortedUnion[{8, 8, 11, 11, 19}]

Out[9]={8, 11, 19}

Adriano Pascoletti

On 14 mag 2007, at 09:25, Raul Martinez wrote:

> Hi all,
>
> I have a list, e.g., {8, 8, 11, 11, 19}. I want to eliminate all
> duplicates so the list becomes {8, 11, 19}. Can anyone suggest a
> command that will do this?
>
> TIA,
>
> Raul Martinez
>



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