Re: Dividing top and bottom

• To: mathgroup at smc.vnet.net
• Subject: [mg21087] Re: Dividing top and bottom
• From: "Stephen P Luttrell" <luttrell at signal.dra.hmg.gb>
• Date: Sun, 12 Dec 1999 23:51:55 -0500 (EST)
• Organization: Defence Evaluation and Research Agency
• References: <786uft\$29u@smc.vnet.net> <78pb5e\$cto@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```>How can I divide the denominator and numerator of an expression by a
>chosen variable and stop the result from simplifying. For example, how
>do I  divide the top and bottom of b/(b-a) by b to give 1/(1-a/b).

This does the trick:

In[1]:=(b/(b-a) /.a->r b//Simplify)/.r->a/b

Out[1]=1/(1 - a/b)

Stephen P Luttrell
Signal Processing and Imagery Department
DERA Malvern, St.Andrew's Road
Malvern, United Kingdom, WR14 3PS

+44 (0)1684 894046 (tel)
+44 (0)1684 894384 (fax)
luttrell at signal.dera.gov.uk (email)

```

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