4 -- | Values of the function f(x,y,z) = 1 + x + xy + xyz taken at nine
5 -- points (hi, hj, jk) with h = 1. From example one in the paper.
6 -- Used in the next bunch of tests.
7 trilinear :: [[[Double]]]
8 trilinear = [ [ [ 1, 2, 3 ],
19 -- | A 3x3x3 array of zeros.
21 zeros = [ [ [ 0, 0, 0 ],
34 -- | A 3x3x3 array of numbers, starting at (0,0,0) == 0 and counting
35 -- up to (2,2,2) == 26 in x,y,z order.
36 naturals :: [[[Double]]]
37 naturals = [ [ [ 0, 1, 2 ],