Re: NIntegrate
- To: mathgroup at smc.vnet.net
- Subject: [mg36544] Re: NIntegrate
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Wed, 11 Sep 2002 13:27:23 -0400 (EDT)
- Organization: Universitaet Leipzig
- References: <alkhi3$ve$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
do you realy think that
1.07577/( 1+7.12336*10^-7 (1. + z)^2 )
with the z inside is numerical ? or do you mean
F[z_?NumericQ]: = NIntegrate[f[y,z], {y, 0, Infinity}]
Regards
Jens
Rob_jack wrote:
>
> 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??
>
> Thanks in advance
>
> --
> Rob_jack