Re: Help with Nitegrate
- To: mathgroup at smc.vnet.net
- Subject: [mg46213] Re: [mg46189] Help with Nitegrate
- From: Anton Antonov <antonov at wolfram.com>
- Date: Thu, 12 Feb 2004 07:15:42 -0500 (EST)
- References: <200402100506.AAA04053@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
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?
>
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>
Which version of Mathematica you are using? With the version 5.0.1 we
get the following
In[114]:=
$Version
$ReleaseNumber
Out[114]=5.0 for Linux (November 18, 2003)
Out[115]=1
In[113]:=
NIntegrate[
Exp[-2.683172/(4*sig)]*
Erfc[Sqrt[(1000-1)/(1000-sig)]*((1.07327/
2)+(sig-1)/(2*0.000132817))]/(sig^(1.5)),{sig,1,1000},
MaxRecursion\[Rule]200]
Out[113]=
0.0000248065
--
======================
Anton Antonov
Wolfram Research, Inc.
======================