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Re: how to find minimum value.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg94967] Re: how to find minimum value.
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 1 Jan 2009 07:27:03 -0500 (EST)
  • References: <gjfjse$d8e$1@smc.vnet.net>

Hi,

I'm not sure, that I understand you
x^2 + 3 x + 1 == 0
is an equation, that has several solution
but never a minimum, the equation is true or not
but never minimal. Can you post your input
to FindMinimum[] or NMinimize[] so that
we can see *what* you want to minimize?

Otherwise

x /. Rest[FindMinimum[x^2 + 3 x + 1, x]][[1]]

and

x /. Rest[NMinimize[x^2 + 3 x + 1, x]][[1]]

work as expected.

Regards
   Jens

mssivava wrote:
> Hi everyone,
> 
> For instance, lets assume that we have an equation like
> a = Solve[x^2 + 3 x + 1 == 0]
> 
> the solution gives 2 x values as
> 
> {{x -> 1/2 (-3 - Sqrt[5])}, {x -> 1/2 (-3 + Sqrt[5])}}
> 
> Which function can I use to find the min x? (Min[] or FindMimimum[] is not working)
> 
> In my real question, I have more than 50 values. So I need to find a mathematica function to find the minimum value from 50 automatically.
> 
> Thank you very much.
> 


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