Re: Re: bug in IntegerPart ?
- To: mathgroup at smc.vnet.net
- Subject: [mg47797] Re: [mg47769] Re: bug in IntegerPart ?
- From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
- Date: Tue, 27 Apr 2004 04:46:47 -0400 (EDT)
- References: <c6g015$4lk$1@smc.vnet.net> <200404260641.CAA06324@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
On 26 Apr 2004, at 15:41, AC wrote: > "DrBob" <drbob at bigfoot.com> wrote in message > news:<c6g015$4lk$1 at smc.vnet.net>... >> There's NO reason to be puzzled. 1.65 and 1.3 can't be represented >> exactly >> in binary, so of course their difference may not be exact, either. >> Hence the >> division problems have different numerators. > > Your 'explanation' makes no sense whatsoever. Mathematica's binary > representations of 1.65-1.3 and 0.35 are the same. That can be seen by > comparing > BaseForm[1.65 - 1.3, 2] > with > BaseForm[0.35,2] > It does make sense and certainly not the same! In[23]:= FullForm[BaseForm[0.35, 2]] Out[23]//FullForm= BaseForm[0.35`,2] In[24]:= FullForm[BaseForm[1.65 - 1.3, 2]] Out[24]//FullForm= BaseForm[0.34999999999999987`,2] Or just evaluate BaseForm using INputform for output. You should not trust in such cases what you see in StandardForm or TraditionalForm. In fact RealDigits[,2] gives you the relevant information. Andrzej Kozlowski Chiba, Japan http://www.mimuw.edu.pl/~akoz/
- References:
- Re: bug in IntegerPart ?
- From: ancow65@yahoo.com (AC)
- Re: bug in IntegerPart ?