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Re: NIntegrate


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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