Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2004
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2004

[Date Index] [Thread Index] [Author Index]

Search the Archive

Problem with NIntegrte

  • To: mathgroup at smc.vnet.net
  • Subject: [mg47725] Problem with NIntegrte
  • From: Joel Storch <jstorch at earthlink.net>
  • Date: Fri, 23 Apr 2004 02:31:08 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

y=BesselJ[0,x]/Sqrt[1+x^2]

Integrate[y,{x,-Infinity,Infimity}] yields
  2 BesselI[0,1/2] BesselK[0,1/2] (1.966)

2 NIntegrate[y,{x,0,Infinity},Method->Oscillatory] gives 1.966
(the integrand is an even function)

However,
NIntegrate[y,{x,-Infinity,Infinity},Method->Oscillatory] gives
0.00044788

(Mathematica V5.1)


  • Prev by Date: RE: Trig identity oscillations
  • Next by Date: Basic Numerical Analysis
  • Previous by thread: Re: Problems integrating BesselJ
  • Next by thread: Re: Problem with NIntegrte