Re: Problem with matching
- To: mathgroup at smc.vnet.net
- Subject: [mg53931] Re: Problem with matching
- From: David Bailey <dave at Remove_Thisdbailey.co.uk>
- Date: Fri, 4 Feb 2005 04:11:52 -0500 (EST)
- References: <ctrngb$brk$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Josef Karthauser 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. =================
>
>
Hi,
This looks like a bug! It works if you make a tiny change:
F[{x,2,c}]F[{x,1,f}]/.F[{___,a_/;True,___}]F[{___,a_,___}]:>yes
David Bailey
dbaileyconsultancy.co.uk