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MathGroup Archive 2005

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Re: Modifying displayed form of an expression?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57179] Re: Modifying displayed form of an expression?
  • From: AES <siegman at stanford.edu>
  • Date: Fri, 20 May 2005 04:43:11 -0400 (EDT)
  • Organization: Stanford University
  • References: <200505170135.VAA23181@smc.vnet.net> <d6hebv$cvn$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In article <d6hebv$cvn$1 at smc.vnet.net>,
 Andrzej Kozlowski <akoz at mimuw.edu.pl> wrote:

> 
> Your "by hand " way does not work simply because you do not force 
> Mathematica to multiply-out the terms in the denominator, so 
> immediately on evaluation  the whole expression is put back into the 
> original form. All you need to do is:
> 
> (Exp[-c]*Numerator[f]/Expand[Exp[-c]*Denominator[f]])
> 

   Ah, that's the clue . . . or at least, it's an approach I can 
   understand, and remember for the future.  Thanks.

> (Exp[-c]*Numerator[f]/Expand[Exp[-c]*Denominator[f]])
> 
> If you do not wish to do so much typing a slightly quicker approach is:
> 
> 
> f /. Exp[x_] :> Exp[x - c]
> 
> 
> (a*E^(b - c))/(1 - E^(d - c))
> 
>


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