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Re: Minimize


On 14 Nov 2008, at 20:36, Artur wrote:

> Dear Mathematica Gurus,
> What Mathematica procedure to use to minimize expotential finction  
> e.g.
> Minimize[Abs[3^d + 5^f - 2^7], {d, f}]
> where we can push: d and f are both Integers
>
> NMinimize[Abs[3^d + 5^f - 2^7], {d, f}]
> Mathematica answer is:
> {2.66454*10^-14, {d -> 2.03248, f -> 2.96773}}
>
> good answer is:
> {d,f}={1,3}
>
> Best wishes
> Artur
>

One possible approach is to read the documentation.

NMinimize[{Abs[3^d + 5^f - 2^7], Element[d | f, Integers]}, {d, f}]
{0., {d -> 1, f -> 3}}

Andrzej Kozlowski


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