SetDelayed and NIntegrate

*To*: mathgroup at smc.vnet.net*Subject*: [mg47805] SetDelayed and NIntegrate*From*: "Mukhtar Bekkali" <mbekkali at iastate.edu>*Date*: Tue, 27 Apr 2004 04:47:44 -0400 (EDT)*Organization*: Iowa State University*Sender*: owner-wri-mathgroup at wolfram.com

Very simple question. Is it possible in Mathematica 5 to execute this code? f[x_,y_]:=f[x,y] (*where f[x,y] is some known function*) g[x_]:=NIntegrate[f[x,y],{y,0,1}] h[x_]:=D[g[x],x] FindRoot[h[x]==0,x] I get a message that Integrand is not numeric and FindRoot stops. I would like to make clear that I do not want to use Integrate. My other question is why this code does not work w=q^x; With[{x=2},Plot[w,{q,0,1}] Thanks. Mukhtar Bekkali

**Follow-Ups**:**Re: SetDelayed and NIntegrate***From:*Anton Antonov <antonov@wolfram.com>