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

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Bob Hanlon

Posts: 906
Registered: 10/29/11
Re: Low precision exponentiation
Posted: Feb 18, 2013 6:00 AM
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To avoid using machine precision enter exact numbers (Rationalize).
Exact result:



To a specified precision

N[%, 25]


Bob Hanlon

On Sun, Feb 17, 2013 at 4:08 AM, Blaise F Egan <blaise@blaisefegan.me.uk> 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

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