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Topic: Low precision exponentiation
Replies: 5   Last Post: Feb 19, 2013 6:51 PM

 Messages: [ Previous | Next ]
 Sseziwa Mukasa Posts: 108 Registered: 8/26/07
Re: Low precision exponentiation
Posted: Feb 18, 2013 5:59 AM

Mathematica interprets numbers entered as decimals as machine precision.
The easiest but not only way to get a high precision answer to your
problem is to enter a rational: N[(5/2)^125,30].

Regards,
Sseziwa

On Sunday, February 17, 2013, Blaise F Egan wrote:

> I am trying to evaluate 2.5^125 to high precision.
>
> R gives 5.527147875260445183346e+49 as the answer but Mathematica with
> N[2.5^125,30] gives 5.52715*10^49 and says that is to machine precision.
>
> I am inexperienced at Mathematica. Am I doing something silly?
>
> Blaise
>
>

Date Subject Author
2/18/13 Sseziwa Mukasa
2/18/13 Andrzej Kozlowski
2/18/13 Bob Hanlon
2/18/13 Murray Eisenberg
2/19/13 Dana DeLouis