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Re: Problems integrating InterpolatingFunction

  • To: mathgroup at smc.vnet.net
  • Subject: [mg116046] Re: Problems integrating InterpolatingFunction
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Sun, 30 Jan 2011 03:32:02 -0500 (EST)

Did you do something like this?

s = y /. First@
     NDSolve[{y'[x] == y[x] Cos[x + y[x]], y[0] == 1}, y, {x, 0, 30}];

Plot[s@x, {x, 0, 30}]

NIntegrate[1/s[x]^2, {x, 0, 30}]

10325.5

Bobby

On Sat, 29 Jan 2011 18:43:59 -0600, Sergio Miguel Terrazas Porras  
<sterraza at uacj.mx> wrote:

> Hello group,
>
> I use NDSolve for a nonlinear differential equation, and I get an  
> InterpolatingFunction, as expected.
>
> I can plot it, evaluate it, etc.
>
> The problem I have is that now I need to integrate 1/(the square of the  
> InterpolatingFunction), and I get nothing but the input back.
>
> Any ideas?
>
> Thanks in advance.
>
> Sergio Terrazas
>


-- 
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