       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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