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/
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