Canonical order...

*To*: mathgroup at smc.vnet.net*Subject*: [mg54989] Canonical order...*From*: Josef Karthauser <joe at tao.org.uk>*Date*: Wed, 9 Mar 2005 06:34:16 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

I'm trying to adjust what Mathematica thinks is canonical order for a particular function F[], so that orderless functions such as Times[F[c], F[a], F[b]] automatically gets ordered according to my specified sort ordering function on F. I thought that I could do it by tweaking with Order, i.e. Order[F[a_], F[b_]] := -Order[a,b] for instance. I was hoping then that, Times[F[a],F[b]] would then become the canonical, Times[F[b],F[a]], but this doesn't happen: : Order[F[a], F[b]] = -1 : Times[F[b], F[a]] = F[a] F[b] : % // FullForm = Times[F[a], F[b]] Ok, so it looks like Sort, isn't paying attention to Order[]. Should it? How do I go about changing the default sort order for a particular function? : Sort[{F[a], F[b]}] = {F[a], F[b]} Joe p.s. I've asked for a lot of help recently, but not given much in return. Many thanks to all of you who are helping me out with this learning curve! :) You're all stars! -- 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. =================

**Follow-Ups**:**Re: Canonical order...***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>