Re: NIntegrate

• To: mathgroup at smc.vnet.net
• Subject: [mg36521] Re: NIntegrate
• From: Alois Steindl <Alois.Steindl at jet2web.cc>
• Date: Wed, 11 Sep 2002 03:27:38 -0400 (EDT)
• Organization: Inst. f. Mechanics II, TU Vienna
• References: <alkhi3\$ve\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```"Rob_jack" <rob_jackNSP at libero.it> writes:

> Hello!
>
> I've this problem with NIntegrate:
> **********************************************
> In[1]=f[y_,z_]: = (y^4/( (1+(8.44*10^-4)^2 * (1+z)^2 y^2) (Exp[z]+1) )
>
> In[2]=F[z_]: = NIntegrate[f[y,z], {z, 0, Infinity}
> **********************************************
>
> Mathematica 4.0 says:
>
> ****************************************************************************
> *
> NIntegrate: : inum : Integrand 1.07577/( 1+7.12336*10^-7 (1. + z)^2 ) is not
> numerical at  {y}={1.}.
> ****************************************************************************
> **
>
> What is it??
>
Hello,
I doubt that you could input your equations as you stated:
The first input has a missing )
The second one a missing ]
In both equations there should be no space in :=

Apart from that the second definitions doesn't seem to make much
sense, maybe it should be F[y_] := ...

Have you assigned y some value before (I get a different error
message, when I mix up the y and z as you did.)

Good luck
Alois

--
Alois Steindl,                  Tel.: +43 (1) 58801 / 32558
Inst. for Mechanics II,         Fax.: +43 (1) 58801 / 32598
Vienna University of Technology,
A-1040 Wiedner Hauptstr. 8-10

```

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