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MathGroup Archive 2005

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Re: Unsorted Union

  • To: mathgroup at smc.vnet.net
  • Subject: [mg61564] Re: Unsorted Union
  • From: "Bill White" <minutiae at gmail.com>
  • Date: Sat, 22 Oct 2005 03:24:04 -0400 (EDT)
  • References: <dj4p6t$gpt$1@smc.vnet.net><dj721s$cpb$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Other interesting things can be done with this memoizing scheme.  For
example, it can be used to collect the duplicate elements in a list:

In[11]:=
DuplicateElements[list_List]:=
  Module[{f,dups={}},
    f[n_]:=(f[n]:=AppendTo[dups,n]);
    f/@list;
    dups];

In[12]:=
list=Table[Random[Integer,{1,10}],{10}]

Out[12]=
{3,10,7,10,2,2,6,9,6,9}

In[13]:=
DuplicateElements[list]

Out[13]=
{10,2,6,9}

Cheers -

bw


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