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MathGroup Archive 2005

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Re: Extended Expand and ExpandAll.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54061] Re: [mg54022] Extended Expand and ExpandAll.
  • From: Josef Karthauser <joe at tao.org.uk>
  • Date: Wed, 9 Feb 2005 09:27:39 -0500 (EST)
  • References: <20050208125521.RHVY10760.lakermmtao09.cox.net@smtp.east.cox.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Of course! I'm just getting familiar with UpValues.  This answers my
question nicely, along with a few that I've not asked yet.

Thanks :)
Joe

On Tue, Feb 08, 2005 at 07:55:21AM -0500, Bob Hanlon wrote:
> f /: Expand[f[a_+b_]] := f[a]+f[b];
> f /: ExpandAll[f[a_+b_]] := f[a]+f[b];
>
> f[a+b]//Expand
>
> f[a] + f[b]
>
> f[a+b]//ExpandAll
>
> f[a] + f[b]
>
>
> Bob Hanlon
>
> >
> > From: Josef Karthauser <joe at tao.org.uk>
To: mathgroup at smc.vnet.net
> > Date: 2005/02/08 Tue AM 05:30:57 EST
> > To: mathgroup at smc.vnet.net
> > Subject: [mg54061] [mg54022] Extended Expand and ExpandAll.
> >
> >
> > ExpandAll is a very useful function.  It doesn't however know how to
> > expand arbitary functions.  Imagine that I've got an F[a + b] which I
> > know is distributive and so,
> >
> >     F[a_ + b_] -> F[a] + F[b].
> >
> > Is there any way of letting Expand/ExpandAll know that it can also
> > expand F[] objects?
> >
> > 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. =================
> >
> >


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