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MathGroup Archive 1998

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Re: FullSimplify results

  • To: mathgroup at smc.vnet.net
  • Subject: [mg12830] Re: [mg12800] FullSimplify results
  • From: Daniel Lichtblau <danl>
  • Date: Fri, 12 Jun 1998 18:15:08 -0400
  • References: <199806120805.EAA24516@smc.vnet.net.>
  • Sender: owner-wri-mathgroup at wolfram.com

>The online help ComplexityFunction has corrections to treat
>integers with  more digits as more complex.  I haven't come up
>with a case where that would  be relevant.  If anyone can come
>up with an example please let me know.

"Better" is in the eyes of the beholder. That said, here is the sort of
example we have in mind.

In[1]:= ee = Log[10^100];

In[2]:= FullSimplify[ee]
Out[2]= 100
Log[10]                                                           

In[4]:= FullSimplify[ee, ComplexityFunction->LeafCount]
Out[4]=
Log[10000000000000000000000000000000000000000000000000000000000000000\
>     000000000000000000000000000000000000]


As for conversion of exponentials to trigs/hyperbolics...sometimes
various conversions are tried and retained, when the complexity
function is a tie, according to a heuristic hierarchy that suggests
when further simplifications may be more likely.


Daniel Lichtblau
Wolfram Research


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