Re: Numerical integration and list of points
- To: mathgroup at smc.vnet.net
- Subject: [mg87662] Re: [mg87622] Numerical integration and list of points
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Tue, 15 Apr 2008 05:51:23 -0400 (EDT)
- Reply-to: hanlonr at cox.net
data = Sort[RandomReal[{0, 1}, {10, 2}]];
f = Interpolation[data];
xMin = f[[1, 1, 1]];
xMax = f[[1, 1, 2]];
Plot[f[x], {x, xMin, xMax}]
Integrate[f[x], {x, xMin, xMax}]
-2.16322
NIntegrate[f[x], {x, xMin, xMax}]
-2.16322
Bob Hanlon
---- guerom00 <guerom00 at gmail.com> wrote:
> Hello everyone,
>
> I have a function which I read as a list of points. I want then to
> estimate its integral. I do more or less this :
>
> data={{x1,y1},{x2,y2},...,{xN,yN}}
> f=Interpolation[data]
> NIntegrate[f[x],{x,x1,xN}]
>
> Is it the correct way ? Because Mathematica hangs without giving me an
> answer although it seems a pretty straightforward thing to do...
>
> Thanks for any suggestions.
>