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Re: Ndsolve

  • To: mathgroup at smc.vnet.net
  • Subject: [mg84059] Re: [mg84023] Ndsolve
  • From: DrMajorBob <drmajorbob at bigfoot.com>
  • Date: Fri, 7 Dec 2007 06:58:20 -0500 (EST)
  • References: <2887900.1197025122155.JavaMail.root@m35>
  • Reply-to: drmajorbob at bigfoot.com

InterpolationFunction _is_ a numerical answer. For instance, execute:

Clear[y]
y = y /. First@
    NDSolve[{y'[x] == Cos@Sin[x^2], y[0] == 0}, y, {x, 0, Pi}]
y[0]
y[1]
y[Pi]
Plot[y[x], {x, 0, Pi}]

and the output is

InterpolatingFunction[{{0.,3.14159}},<>]

0.

0.919768

2.52142

(and a plot)

Bobby

On Fri, 07 Dec 2007 02:01:10 -0600, DrunkenButterfly  
<darkladymacbeth at hotmail.com> wrote:

> I'm confused about the "interpolation" thing. Why if I have some diff eq  
> with boundary conditions NdSolve doesn't give me a numerical solution? 
> And suppose I have
>
> y'[x]== f[x]
> with y[a]== b as a condition (a,b any numbers)
>
> How can I find f[0], for example? (Generalizing, how can I find f[c], 
> where c is a number?)
>
> Thanks to everyone! And please, help me :(
>
>



-- 

DrMajorBob at bigfoot.com


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