Computes Simpson integration rule coefficients.
number of points of the simpson formula a single dimension
number of dimensions
simpson.coeff computes the coefficients of the standard Simpson rule (for unit spaced points), according to the sequence (1+4+2+4+...+2+4+1)/3 for each dimension.
simpson.kD expand the formula over a grid of n^k points in
a vector of
n coefficients (for
simpson.coeff), a k-dimensions array with a total of n^k elements for
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