[Help-gsl] gsl_monte_vegas_integrate

[Tommy Nordgren]

How accurately do I need to compute the integrand in a multiple  
integral to be estimated by the
Vegas algorithm? The integrand is expensive to compute (a Fourier  
integral along a radius vector)
in a 6-dimensional integral over infinite space.
My idea is to first compute the integral with a small number of  
points, and then use that first approximation
to estimate suitable values for absolute and relative accuracy when  
doing the Fourier integration part of the problem.
(Note: For my problem I'm using a 6-dimensional generalisation of  
Spherical Coordinates.
This makes the interation region infinite in the Radius alone, which  
turns my problem into:
For five angles: Integrate the value of the (Fourier integral along  
Radius Vector) with respect to the angles)

My basic problem is that I don't know enough about the Vegas algorithm  
to compute good esimates of
how accurately I need to compute the Fourier Integrals.
Any ideas??
---------
See the amazing new SF reel: Invasion of the man eating cucumbers from  
outer space.
On congratulations for a fantastic parody, the producer replies :  
"What parody?"

Tommy Nordgren
address@hidden