3D integrals

[Massimiliano Rossi]

Hi everybody,
 
I'm trying to use Scilab to calculate the fraction of energy encircled
in a gaussian beam as a function of the distance to its center. Simply
put, I should calculate the volume defined by the intersection of a 3D
gaussian and a cylinder. I'm trying to use int3d but with without really
getting anything out of it. Has anybody any advice on this problem?
 
Thanks in advance,
Max
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