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MathGroup Archive 2002

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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


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