       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*x/.NDSolve[{a'[z]==x*z,a==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,x], where a[z] satisfies a differential equation
>>a'[z]=x*z say. The code is like:
>>FindMinimum[x^2-a*x/.NDSolve[{a'[z]==x*z,a==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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