From: Lorenzo Moneta <Lorenzo.Moneta_at_cern.ch>

Date: Fri, 25 Aug 2006 10:56:03 +0200

Date: Fri, 25 Aug 2006 10:56:03 +0200

Hi Andrew,

I don't know of a method for 2d with oscillatory function.
Hower, you should be able for a Bessel of order 0 to solve the
integral analytically,

using the Bessel J0 definition

see http://en.wikipedia.org/wiki/Bessel_function

Cheers,

Lorenzo

On 24 Aug 2006, at 12:14, andreyk1_at_post.tau.ac.il wrote:

*>*

*>*

*> Dear rooters,*

*>*

*> I need to integrate over two dimensionl oscillating function*

*> (TMath::BesselJ(0,x*y), 0<x<inf, 0<y<inf). I use TF1 with *

*> IntegralMultiple, but*

*> the answer is not stable, a change in max_points leads to a *

*> different result. I*

*> tried to increas the number of max_points to 1e+6 but the result is *

*> still*

*> unstable. Is there some method of integrating over oscillating *

*> function with*

*> arbitry dimensions? (in my case it is dim = 2).*

*>*

*>*

*> Thanks a lot!*

*>*

*>*

*> Andrew*

*>*

*> ----------------------------------------------------------------*

*> This message was sent using IMP, the Internet Messaging Program.*

*>*

*>*

Received on Fri Aug 25 2006 - 10:55:10 MEST

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