Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2006
*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 2006

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

Search the Archive

How can I get this spiked Integral evaluated???

  • To: mathgroup at smc.vnet.net
  • Subject: [mg71957] How can I get this spiked Integral evaluated???
  • From: Zeno <zeno333 at mindspring.com>
  • Date: Wed, 6 Dec 2006 06:03:34 -0500 (EST)
  • Organization: EarthLink Inc. -- http://www.EarthLink.net

This is an integral with a spike that is not in the middle of the
integral range. Here is the integral...

NIntegrate[Exp[-x^2], {x, -900, 1000}]

Mathemtaica 5.2.2 gives this error message....

 "Numerical \integration stopping due to loss of precision. Achieved
neither the requested \PrecisionGoal nor AccuracyGoal; suspect one of
the following: highly \oscillatory integrand or the true value of the
integral is 0. If your \integrand is oscillatory on a (semi-)infinite
interval try using the option \Method->Oscillatory in NIntegrate. 
More?

However, to use the option "Method->Oscillatory" one of the bounds of
the integral must be infinity, so that would not work here. How do I
get it to to the integral in the range -900 to 1000??
The correct answer is 1.77245.


  • Prev by Date: System of Linear Equations
  • Next by Date: Re: how many times nestwhile repeats calculations?
  • Previous by thread: Re: System of Linear Equations
  • Next by thread: Re: How can I get this spiked Integral evaluated???