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? > >_________________________________________________________________ >Check out the great features of the new MSN 9 Dial-up, with the MSN Dial-up >Accelerator. http://click.atdmt.com/AVE/go/onm00200361ave/direct/01/ > > 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. ======================