Re: Strange error message from NIntegrate
- To: mathgroup at smc.vnet.net
- Subject: [mg28178] Re: Strange error message from NIntegrate
- From: Henrik Holm <h.holm at spray.no>
- Date: Tue, 3 Apr 2001 02:37:55 -0400 (EDT)
- References: <9a964c$gtv@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
[BobHanlon at aol.com] > You made the power of x a list (brackets vice parenthreses). Thank you, that seems to be the problem. > There are still problems with the numerical integration. However, you can > > - approximate the answer with a finite upper limit of integration > - change the number of intervals (GaussPoints) > - change the method of numerical integration > > NIntegrate[x^(3/2)*Exp[-x]*BesselI[3/2,x/2], {x,0, 1000}] > > 1.0030037040845279 > > NIntegrate[x^(3/2)*Exp[-x]*BesselI[3/2,x/2], {x,0, Infinity}, > GaussPoints -> 10] > > 1.0030037040849122 > > NIntegrate[x^(3/2)*Exp[-x]*BesselI[3/2,x/2], {x,0, Infinity}, > Method -> Trapezoidal] > > 1.0030037040847963 Also. thanks for these tips. How can I ask Mathematica to show the answer with more than a few digits? (It seems that 6 digits is standard.) Henrik Holm
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