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)