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Re: rule based program for "Deleting repeated members of a list."

  • To: mathgroup at smc.vnet.net
  • Subject: [mg81959] Re: rule based program for "Deleting repeated members of a list."
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Sun, 7 Oct 2007 05:41:48 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <fe7j44$qga$1@smc.vnet.net>

mumat wrote:
> Hi,
> 
> I have a list s={a,b,c,c,d,e,e,f,g,g,g,h,a,b};
> 
> I need to write a program so that it reads the list and ignors
> repeated elements; so it outputs the following:
> 
> RepeatRemover[s]={a,b,c,d,e,f,g,h,a,b};
> 
> I am looking for a rule-based program to do this!
> 
> Any help would be greatly appreciated.

In[1]:= s = {a, b, c, c, d, e, e, f, g, g, g, h, a, b};

In[2]:= Union /@ Split[s] // Flatten

Out[2]= {a, b, c, d, e, f, g, h, a, b}

In[3]:= s //. {a___, b_, b_, c___} -> {a, b, c}

Out[3]= {a, b, c, d, e, f, g, h, a, b}

Regards,
-- 
Jean-Marc


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