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Re: Mathematica freezes?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg126987] Re: Mathematica freezes?
  • From: Jason Ebaugh <ebaughjason at gmail.com>
  • Date: Fri, 22 Jun 2012 03:00:11 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <jrup2b$flc$1@smc.vnet.net>

The evaluation does not complete and I get this message:
"NIntegrate::slwcon: Numerical integration converging too slowly; suspect one of the following: singularity, value of the integration is 0, highly oscillatory integrand, or WorkingPrecision too small. >>"

But the front end application itself does not freeze. I can just choose "abort evaluation" for the pull down menu and all is well.



Jason Ebaugh



On Thursday, June 21, 2012 4:21:15 AM UTC-5, Alex Khmelnitsky wrote:
> When I try to do the following commands:
> 
> r = 3.7; a = 5.1; z = 1.1; p = 0.61; 
> 
> e = Exp[I f]; 
> ep = Exp[I p]; 
> tc = r \[Rho] ep/e; 
> l1 =  1/2 (Sqrt[(r + a)^2 + z^2] - Sqrt[(r - a)^2 + z^2]); 
> l2 = 
>  1/2 (Sqrt[(r + a)^2 + z^2] + Sqrt[(r - a)^2 + z^2]); 
> sq = Sqrt[a^2 - \[Rho]^2]; 
> sq1 = Sqrt[a^2 - l1^2]; 
> sq2 = Sqrt[ l2^2 - a^2]; 
> \[Rho] = a Sin[x]; 
> ff1 =  2 Pi (a^2/(a^2 - tc)^(3/2) ArcTan[Sqrt[a^2 - tc]/sq2] - (
>     tc sq2)/((a^2 - tc) (l2^2 - tc)));
> 
> NIntegrate[ff1 \[Rho]^2/e, {f, 0, 2 Pi}, {x, 0, Pi/2}], 
> 
> it freezes Mathematica. Does it freeze on anyone else's computer?
> 
> Thanks.



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