       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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