Re: Replacement

• To: mathgroup at smc.vnet.net
• Subject: [mg4477] Re: Replacement
• From: rubin at msu.edu (Paul A. Rubin)
• Date: Mon, 29 Jul 1996 02:37:29 -0400
• Organization: Michigan State University
• Sender: owner-wri-mathgroup at wolfram.com

```In article <4shud7\$g7n at ralph.vnet.net>,
ges at vsnhdd.cern.ch (Sergej Gerassimov) wrote:
->Hi,
->
->I have something like
->
->x/Sqrt[a^2+b^2]+Sqrt[a^2+b^2]/y
->
->and I'd like to substitute Sqrt[a^2+b^2] by r.
->
->x/Sqrt[a^2+b^2]+Sqrt[a^2+b^2]/y //. Sqrt[a^2+b^2]->r
->gives:
->
->      x         r
->------------- + -
->Sqrt[a^2+b^2]   y
->
->(replace one only in the numerator)
->How to replace Sqrt[a^2+b^2] by r everywhere in the expression?
->
->Thanks.
->				S.

In[]:=  x/Sqrt[a^2+b^2]+Sqrt[a^2+b^2]/y //.
(a^2+b^2)^Rational[ n_, 2 ] -> r^n
Out[]=  x   r
- + -
r   y

Paul

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* Paul A. Rubin                                  Phone: (517) 432-3509   *
* Department of Management                       Fax:   (517) 432-1111   *
* Eli Broad Graduate School of Management        Net:   RUBIN at MSU.EDU    *
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