Re: Minimization Algebraically
- To: mathgroup at smc.vnet.net
- Subject: [mg103384] Re: Minimization Algebraically
- From: Szabolcs Horvát <szhorvat at gmail.com>
- Date: Sat, 19 Sep 2009 05:26:53 -0400 (EDT)
- References: <h8vkeh$8un$1@smc.vnet.net>
On 2009.09.18. 11:38, Bayers, Alexander wrote:
> I am currently trying to minimize the following function in Mathematica:
>
> ((360*(-1 + E^(0.2493150684931507*r0)))/91 - r[L3m])^2
>
> Using r0. When I try to minimize this algebraically using Minimize,
> however, I receive the following answer:
>
> Minimize[((360*(-1 + E^(0.2493150684931507*r0)))/91 - r[L3m])^2, {r0}]
>
> Instead of an algebraic answer. Is there any way to coerce Mathematica
> to return the algebraic answer through a call to minimize?
>
Do not use inexact number ("decimals") if you need a symbolic answer.
Rationalize[] can help to convert the quantities in the expression to
exact forms.
From the little information you provided it looks like the function r[]
was not defined. Minimize will only work with explicit expressions, it
can't handle unspecified functions.