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MathGroup Archive 2005

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Re: Problem with matching.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53918] Re: [mg53907] Problem with matching.
  • From: DrBob <drbob at bigfoot.com>
  • Date: Fri, 4 Feb 2005 04:11:13 -0500 (EST)
  • References: <200502022310.SAA11969@smc.vnet.net>
  • Reply-to: drbob at bigfoot.com
  • Sender: owner-wri-mathgroup at wolfram.com

I think it's because the two a_ patterns aren't treated as representing the same a.

But this works:

F[{x, 2, c}]*F[{x, 1, f}] /. F[{___, a_, ___}]*F[{___, b_, ___}] /; a == b :> yes

yes

Bobby

On Wed, 2 Feb 2005 18:10:51 -0500 (EST), Josef Karthauser <joe at tao.org.uk> wrote:

> Can someone tell me why this doesn't match?
>
> F[{x, 2, c}]F[{x, 1, f}] /. F[{___, a_, ___}]F[{___, a_, ___}] :> yes
>
> I'm expecting 'yes' to be returned if any of the list arguments to F[]
> contain the same value.  It doesn't match however; what am I doing
> wrong?
>
> Thanks,
> Joe
> --
> Josef Karthauser (joe at tao.org.uk)	       http://www.josef-k.net/
> FreeBSD (cvs meister, admin and hacker)     http://www.uk.FreeBSD.org/
> Physics Particle Theory (student)   http://www.pact.cpes.sussex.ac.uk/
> ================ An eclectic mix of fact and theory. =================
>
>
>
>
>



-- 
DrBob at bigfoot.com
www.eclecticdreams.net


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