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Re: Mod bug

  • To: mathgroup at smc.vnet.net
  • Subject: [mg42832] Re: Mod bug
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 30 Jul 2003 19:30:20 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <bg7vh3$hhp$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

in the binary system the floating point number 0.1 is 
an infinite fraction, avoid floating point number when ever
possible and you will see that

Mod[0.5,1/10]

work as expected.

Regards
  Jens


frauendorfer wrote:
> 
> A program written in version 3 using Mod  fails completely in version 4.2
> and 5.
> Checking Mod  I found a quite erratic behavior.For example Mod[.5,.1] gives
> the result 0.1.
> A list increasing from 0.1 to 10 in 100 steps of 0.1, run through Mod[*,.1]
> gives 47 wrong answers.
> 
> E. Frauendorfer


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