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Groups > comp.soft-sys.math.mathematica > #16700

Re: standard floating point arithmetic in Mathematica?

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On 3/27/2014 4:00 AM, Alan wrote:
> I would like to illustrate some limitations with floating point calculations.
>Can I force Mathematica to do floating point computations
>at a standard float size and the display the full results (as the same size float)?
>
> E.g., if I enter
> 0.1+0.2
> I would like to see
> 0.30000000000000004
>
> Thanks,
> Alan Isaac
>

This particular result already does that. Use InputForm to see it:

0.1 + 0.2
     0.3

InputForm[%]
     0.30000000000000004

But in general, to force all computation in $MachinePrecision, one
way is:

Block[{
   $MinPrecision=$MachinePrecision,$MaxPrecision = $MachinePrecision},

     ... do computation floating point computation here
     .... in $MachinePrecision
]


--Nasser

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Thread

standard floating point arithmetic in Mathematica? Alan <alan.isaac@gmail.com> - 2014-03-27 09:00 +0000
  Re: standard floating point arithmetic in Mathematica? "Nasser M. Abbasi" <nma@12000.org> - 2014-03-28 07:31 +0000
  Re: standard floating point arithmetic in Mathematica? Kevin <kjm@KevinMcCann.com> - 2014-03-28 07:31 +0000
  Re: standard floating point arithmetic in Mathematica? David Reiss <dbreiss@gmail.com> - 2014-03-28 07:30 +0000
  Re: standard floating point arithmetic in Mathematica? Richard Fateman <fateman@cs.berkeley.edu> - 2014-03-29 06:15 +0000
  Re: standard floating point arithmetic in Mathematica? David Annetts <david.annetts@iinet.net.au> - 2014-03-30 08:42 +0000

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