Re: Replacement Rule with Sqrt in denominator
- To: mathgroup at smc.vnet.net
- Subject: [mg114337] Re: Replacement Rule with Sqrt in denominator
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Wed, 1 Dec 2010 02:13:15 -0500 (EST)
On 11/20/2010 3:11 AM, kj wrote: >I don't know a way to write the replacement rule so that it works >for both Sqrt[x] and 1/Sqrt[x], but maybe someone else does. This is easy using Alternatives. For example: In:= a Sqrt[x] /. Sqrt[x] | Power[x, _] -> b Out= a b In:= a/Sqrt[x] /. Sqrt[x] | Power[x, _] -> b Out= a b Note, I've only shown a simple way to solve the specific issue. I did not make the alternative using Power sufficiently restrictive to prevent say x^2 from being replaced by b. If there is to be made to cover the possibility of that something like x^2 will be present but should not be replaced, the alternative using Power would need to be more specific.