Groups > comp.soft-sys.math.mathematica > #16597

Re: Possible bug in Floor function?

From	John Doty <noqsiaerospace@gmail.com>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Re: Possible bug in Floor function?
Date	2014-03-02 06:50 +0000
Message-ID	<leukci$sfv$1@smc.vnet.net> (permalink)
References	<20140215090214.8888569D4@smc.vnet.net> <lec9gg$l53$1@smc.vnet.net>
Organization	Time-Warner Telecom

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On Sunday, February 23, 2014 2:54:56 AM UTC-5, Itai Seggev wrote:
> No, Floor doesn't use Simplify.  It uses adaptive numerical approximation.
> 
> It's just that for your hidden integer, it gets an answer it can verify (on its
> 
> first attempt, no less), whereas for the Log case that started the threade it
> 
> can't verify its answer and defaults to raw machine arithmetic.

OK, so that leads to the next question: why doesn't this work for Log[100]/Log[10]? Somewhere it has a mechanism that allows it to verify Log[100]/Log[10]==2, as we see when we apply FullSimplify. Shouldn't it be using that mechanism in this case?

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Re: Possible bug in Floor function? Itai Seggev <itais@wolfram.com> - 2014-02-23 07:54 +0000
  Re: Possible bug in Floor function? John Doty <noqsiaerospace@gmail.com> - 2014-03-02 06:50 +0000

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