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I need to integrate w(x,y,z)*V(x,y,z) over a cylindrical domain, it would be fairly simple if V had a "formula" describing the function, but i only have V as a number at a bunch of points(1000 points or so) inside the domain(and on the boundary), w is any C2 function which is zero on the boundaries and not identically zero inside.

I chose a function w and found its values at the same points as V is known, but i'm not sure which is the best way to find an approximation to this integral, any help much appreciated, as always.