Re: Problem with matching.

• To: mathgroup at smc.vnet.net
• Subject: [mg53913] Re: [mg53907] Problem with matching.
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Fri, 4 Feb 2005 04:11:08 -0500 (EST)
• Reply-to: hanlonr at cox.net
• Sender: owner-wri-mathgroup at wolfram.com

```F[{___,a_,___}]F[{___,a_,___}]//FullForm

Power[F[List[BlankNullSequence[],Pattern[a,Blank[]],BlankNullSequence[]]],2]

The two terms on the LHS of the rule are identical so they are multiplied to
form F^2.  Use the following:

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

yes

Bob Hanlon

>
> From: Josef Karthauser <joe at tao.org.uk>
To: mathgroup at smc.vnet.net
> Date: 2005/02/02 Wed PM 06:10:51 EST
> To: mathgroup at smc.vnet.net
> Subject: [mg53913] [mg53907] Problem with matching.
>
> 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/
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> ================ An eclectic mix of fact and theory.
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>
>

```

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