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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