RE: Most efficient method of simplifying
- To: mathgroup at smc.vnet.net
- Subject: [mg16210] RE: [mg16187] Most efficient method of simplifying
- From: "Ersek, Ted R" <ErsekTR at navair.navy.mil>
- Date: Fri, 5 Mar 1999 00:40:44 -0500
- Sender: owner-wri-mathgroup at wolfram.com
Greg Arnold wrote: _____________________ I realize this is not a well defined questions, but I'm working with some fairly nasty ratios of functions (generally ratios of polynomials, but not always). At several points I do some substitutions and then I want to simplify the result such that (1) all variables are removed (cancelled) that can be, and (2) the result simplifies to zero if appropriate. "Simplify" is the obvious choice, but I've had many cases where simplify did not cancel and/or find the zero solution. So, I could use FullSimplify, but both versions can take days to run. All I really need is to "expand", but again there are cases where expand doesn't cancel and/or produce the zero result. "ExpandAll" can make even the simpliest expression exremely complicated. So, I'm looking for any advice others may have for more efficient ways of doing Simplify[ Expand[ ]]. As I said, this is not a well defined question & I suppose the ultimate answer is to use FullSimplify and buy the largest computer available. ________________________ Consider using Cancel[expr] Keep in mind Cancel has options Extension, Trig. See 'Further Examples' in the Help Browser. _________________________ Instead of ExpandAll you may be better off with: ExpandNumerator[expr]/ExpandDenominator[expr] Both ExpandNumerator and ExpandDenominator use the option Trig. _________________________ Regards, Ted Ersek