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MathGroup Archive 2008

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Re: Minimize


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
>  
>
Add a constraint:

In[43]:= NMinimize[{Abs[3^d + 5^f - 2^7], {d, f} \[Element] Integers}, 
{d, f}]

Out[43]= {0.,{d->1,f->3}}

Carl Woll
Wolfram Research


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