MathGroup Archive 1999

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Most efficient method of simplifying

  • To: mathgroup at smc.vnet.net
  • Subject: [mg16220] Re: [mg16187] Most efficient method of simplifying
  • From: Carl Woll <carlw at fermi.phys.washington.edu>
  • Date: Fri, 5 Mar 1999 00:40:50 -0500
  • Sender: owner-wri-mathgroup at wolfram.com

Greg,

I think it would be helpful if you could give an example of the kind of
simplification you are after, one where Simplify didn't do what you want.
I'm sure this would elucidate some clever solutions from the newsgroup.

Carl Woll
Dept of Physics
U of Washington

On Tue, 2 Mar 1999, Greg Arnold wrote:

> Hello all:
> 
> 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.
> 
> Thanks,
> 
> Greg
> 
> 



  • Prev by Date: Producing ASCII File
  • Next by Date: Re: I have problem with these functions!!
  • Previous by thread: RE: Most efficient method of simplifying
  • Next by thread: Re: Most efficient method of simplifying