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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>