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MathGroup Archive 2003

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Re: FindMinimum Problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg44650] Re: FindMinimum Problem
  • From: Jiang Xiao <jiang.xiao at physics.gatech.edu>
  • Date: Wed, 19 Nov 2003 04:59:15 -0500 (EST)
  • Organization: Georgia Institute of Technology
  • References: <bpa1rv$19t$1@smc.vnet.net> <bpd1bi$c9c$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

thank you for replying, I tried it, but it still doesn't work.
what's the meaning of x_?NumericQ?
if I let foo[x_?NumericQ]:=x^2-x, findminimum can't get output either, 
but no problem with foo[x_]:=x^2-x.

Jiang

Jens-Peer Kuska wrote:
> Hi,
> 
> you ust make a function
> 
> foo[x_?NumericQ]:=x^2-a[0]*x/.NDSolve[{a'[z]==x*z,a[1]==1},a,{z,0,1}]
> 
> FindMinimum[foo[x],{x,-1,1}]
> 
> Regards
>   Jens
> 
> Jiang Xiao wrote:
> 
>>Hi, all,
>>    recently I am dealing with a problem as following, findminimum(over x)
>>of a function f[a[0],x], where a[z] satisfies a differential equation
>>a'[z]=x*z say. The code is like:
>>FindMinimum[x^2-a[0]*x/.NDSolve[{a'[z]==x*z,a[1]==1},a,{z,0,1}],{x,-1,1}]
>>
>>the problem is that I can do it in mathematica 4.2, but can't in mathematica
>>5.0 now. Do anybody where is the problem?
>>
>>thanks,
>>
>>Jiang
> 
> 


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