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MathGroup Archive 2007

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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82180] Re: rule based program for "Deleting repeated members of a list."
  • From: "Jean-Marc Gulliet" <jeanmarc.gulliet at gmail.com>
  • Date: Sun, 14 Oct 2007 06:08:50 -0400 (EDT)
  • References: <fe7j44$qga$1@smc.vnet.net> <fea9ju$k4g$1@smc.vnet.net>

Szabolcs Horvát wrote:

> Jean-Marc Gulliet wrote:

> > I was wandering why you used b and d as pattern name with a condition on
> > them rather than b and c, but I realized that when using c as pattern
> > name in place of d the replacement fails.
> >
> > In[1]:= s = {a, b, c, c, d, e, e, f, g, g, g, h, a, b};
>
> Hi,
>
> You probably noticed this by now, but on the following line there should
> be {a,b,d} instead of {a,b,d}
>
> > s //. {a___, b_, c_, d___} :> {a, b, c} /; b == c
>
> ---------------------------------------^
>
> s //. {a___, b_, c_, d___} :> {a, b, d} /. b === c

Hi Szabolcs,

Thanks for finding my silly mistake.

Best regards,
-- 
Jean-Marc


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