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MathGroup Archive 2007

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Re: a problem about NDSolve and NIntegrate

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80001] Re: a problem about NDSolve and NIntegrate
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 10 Aug 2007 01:54:21 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <f9emog$lpq$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

a) you mean f[c_?NumericQ] :=... and NumberQ because NumberQ is a test
    and you need ? in the pattern to apply the test.
b) in you n[] function you use y[x] but only f[c] return
    something that include y[x] -- how shall n[] find aut that
    it need to compute f[c] to get y[] ??

Regards
   Jens

lynn wrote:
> Hello,
> 
> I'm tring to solve a diffrential equation with
> 
> its upper boundary as a variable.
> 
> and then I want to integrate it, and define
> 
> it as a funcion with two variable.
> 
> However, I don't know why it doesn't work at the second step.
> 
> 
> my equation is as following,
> 
> f[c_?NumberQ]:=y[x]/.NDSolve[{eqn,y[0]==1,y'[0]==0},y,{x,0,c},MaxSteps-
>> 10000][[1]]
> 
> n[w_NumberQ,c_NumberQ]:=NIntegrate[c*y[x]*(r-w)],{r,w,1}]
> 
> function f works well, however there's some problem in funcion n,
> 
> and it's confused me for a long time...,
> 
> thanks for your help!!
> 
> Best Regards!!
> Lynn
> 
> 


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