Re: rule based program for "Deleting repeated members of
- To: mathgroup at smc.vnet.net
- Subject: [mg81935] Re: [mg81917] rule based program for "Deleting repeated members of
- From: adriano.pascoletti at dimi.uniud.it
- Date: Sun, 7 Oct 2007 05:29:12 -0400 (EDT)
> 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.
>
> C.S.
>
>
>
In my previous reply I didn't include what C.S. was looking for:
In[8]:= s //. {pre___, x_, x_, post___} :> {pre, x, post}
Out[8]= {a, b, c, d, e, f, g, h, a, b}
I included only the more efficient solution
In[9]:= First /@ Split[s]
Out[9]= {a, b, c, d, e, f, g, h, a, b}
Adriano Pascoletti