Re: Problem with collect
- To: mathgroup at smc.vnet.net
- Subject: [mg6489] Re: Problem with collect
- From: Paul Abbott <paul at physics.uwa.edu.au>
- Date: Mon, 24 Mar 1997 21:38:42 -0500 (EST)
- Organization: University of Western Australia
- Sender: owner-wri-mathgroup at wolfram.com
Hans Steffani wrote:
> Take
>
> blah1 vv ss + blah2 vv ss +
> blah3 vv aa + blah4 vv aa +
> blah5 ss aa + blah6 ss aa
> Collect[%,{ss vv,vv aa,ss aa}]
>
> this produces
>
> aa blah5 ss + aa blah6 ss + aa blah3 vv + aa blah4 vv +
> blah1 ss vv + blah2 ss vv
>
> although I want
>
> aa vv(blah3+blah4) + ss vv(blah1+blah2) + ss aa(blah5+blah6)
In version 3.0, FullSimplify does what you want.
In[1]:= FullSimplify[blah1 vv ss + blah2 vv ss +
blah3 vv aa + blah4 vv aa + blah5 ss aa + blah6 ss aa]
Out[5]= aa (blah5+blah6) ss+aa (blah3+blah4) vv+(blah1+blah2) ss vv
Cheers,
Paul
_________________________________________________________________
Paul Abbott
Department of Physics Phone: +61-9-380-2734
The University of Western Australia Fax: +61-9-380-1014
Nedlands WA 6907 paul at physics.uwa.edu.au
AUSTRALIA http://www.pd.uwa.edu.au/Paul
God IS a weakly left-handed dice player
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