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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: [mg80021] Re: a problem about NDSolve and NIntegrate
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Fri, 10 Aug 2007 06:45:11 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <f9emog$lpq$1@smc.vnet.net>

lynn wrote:
> 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}]
------^(1)------^(1)-----------------------------^(2)
1. To apply a test function (predicate) to a pattern, you must use an 
question mark '?' (as you did when defining f).
2. Extraneous square bracket.

A /syntacticly/ correct code is

n[w_?NumberQ, c_?NumberQ] := NIntegrate[c*y[x]*(r - w), {r, w, 1}]

<snip>

-- 
Jean-Marc


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