Re: standard floating point arithmetic in Mathematica?
- To: mathgroup at smc.vnet.net
- Subject: [mg132484] Re: standard floating point arithmetic in Mathematica?
- From: "Nasser M. Abbasi" <nma at 12000.org>
- Date: Fri, 28 Mar 2014 03:31:10 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- Delivered-to: l-mathgroup@wolfram.com
- Delivered-to: mathgroup-outx@smc.vnet.net
- Delivered-to: mathgroup-newsendx@smc.vnet.net
- References: <lh0pbt$m4l$1@smc.vnet.net>
- Reply-to: nma at 12000.org
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