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MathGroup Archive 2005

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Re: Using InterpolatingFunction in Argument of NIntegrate

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57806] Re: Using InterpolatingFunction in Argument of NIntegrate
  • From: dh <dh at metrohm.ch>
  • Date: Thu, 9 Jun 2005 05:17:39 -0400 (EDT)
  • References: <d8691p$c70$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Iggy,
what you describe should work. I guess you have a syntactical error. 
E.g. you have to write g[f[x]]] instead of: g(f(x)
If this does not help, you have to be more specific.
sincerely, Daniel


Iggy wrote:
> Hi,
> 
> I am solving numberically an ODE and outputing the results into a function 
> f(x). This f(x) is some InterpolatingFunction.
> 
> I would like to then use f(x) in a call to NIntegrate in a way such as:
> 
> NIntegrate[g(f(x),{x,0,1}]
> 
> However I get an integrand not numerical error. I can easily Plot g(f(x)) 
> and if I replace f(x) with some function like x^2 everything works too.
> 
> How can I get around this?
> 
> Thanks,
> 
> Iggy
> 


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