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 > >