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MathGroup Archive 2007

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Re: numeric integration

  • To: mathgroup at smc.vnet.net
  • Subject: [mg81137] Re: numeric integration
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 14 Sep 2007 03:26:04 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <fcb40h$fm3$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

try
f[q_?NumericQ]: = NIntegrate[Sin[x + q], {x, 0, 1}]

and

NIntegrate[f[x], {x, 0, 0.1}]

Regards
   Jens


C. Seja wrote:
> Hi,
> 
> I'd like to intergate a function f with NIntegrate:
> NIntegrate[f[x], {x, 0, 0.1}]
> 
> But this doesn't work if, i.e.
> 
> f = NIntegrate[Sin[x + #], {x, 0, 1}] &
> 
> It will give a wrong result (0.7 instead of 0.05). Why? I mean, I can 
> evaluate f at any point without problems, i.e. f[0.1] gives 0.37. So why 
> doesn't
> 
> NIntegrate[f[x], {x, 0, 0.1}]
> 
> work? It doesn't even give a warning! So, is there a proper way to do this 
> (without using one two-dimensional NIntegrate)?
> 
> Regards
> 
> C. Seja
> 
> 
> 


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