Re: question about NIntegrate
- To: mathgroup at smc.vnet.net
- Subject: [mg128743] Re: question about NIntegrate
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Fri, 23 Nov 2012 03:25:13 -0500 (EST)
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- Delivered-to: l-mathgroup@wolfram.com
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On 11/22/12 at 4:33 AM, dsmirnov90 at gmail.com wrote:
>I want to use function NIntegrate to integrate a rather complicated
>function which should be calculated numerically and returns a Table.
>However, when I write something of the kind:
>Clear[f] f[(a_)?NumericQ] := {a^2}; NIntegrate[f[x], {x, -1, 1}]
>I get an error: "Integrand f[x] is not numerical at {x} =
>{-0.984085}"
>Strangely, the following code works fine:
>NIntegrate[f[1], {x, -1, 1}]
>giving the result {2.}
>What am I doing wrong?
Is there a reason you have defined f to return a list rather
than a number? This works:
In[7]:= Clear[f]
f[a_?NumericQ] := a^2
NIntegrate[f[x], {x, -1, 1}]
Out[9]= 0.666667