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
>
--
DrMajorBob at yahoo.com