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MathGroup Archive 2004

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Re: Help with Nitegrate

  • To: mathgroup at
  • Subject: [mg46212] Re: [mg46189] Help with Nitegrate
  • From: "Sseziwa Mukasa,,(978) 536-2359" <mukasa at>
  • Date: Thu, 12 Feb 2004 07:15:41 -0500 (EST)
  • References: <>
  • Sender: owner-wri-mathgroup at

On Feb 10, 2004, at 12:06 AM, Someone wrote:

> I am trying to use the numerical integration function to find evaluate 
> this
> integeral:
> NIntegrate[Exp[-2.68317^2/(4* sig)]*Erfc[Sqrt[(1000 - 1)/(1000 -
> sig)]*((1.07327/
>         2) + (sig - 1)/(2*0.000132817))]/(sig^(1.5)), { sig, 1, 1000}].
> I am getting all sorts of error messages particularly that the 
> integral is
> not numerical at some points in the interval. I've tried all the 
> options
> possible and no success.  Any ideas?

There's an obvious problem at sig = 1000, Erfc's argument is undefined. 
  You may want to replace that with the limiting value of the 
expression.  Unfortunately Mathematica can't find one, and I'm too lazy 
to look into it further.



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