Strange results of Integrate
- To: mathgroup at smc.vnet.net
- Subject: [mg92874] Strange results of Integrate
- From: osepsi <sepsi.ors at gmail.com>
- Date: Thu, 16 Oct 2008 05:05:55 -0400 (EDT)
Dear Group,
I wanted to solve the following integral:
Integrate[Exp[I*k*Sqrt[x^2+y^2+z^2]]/Sqrt[x^2+y^2+z^2],{x,-a,a},{y,-
b,b},{z,-c,c}]
The result was 0. (It is wrong solution...)
Replacing b and c with a gives back the integral unevaluated.
With NIntegrate I have the result, but with some warning messages.
Questions:
1. Why gives Mathematica the wrong answer for the first formula?
2. Does anyone know the right method (Method->...) for numerical
integration of this type of integral.
Thanks, =D6rs