+type Values sh = Array sh Double
+type Values1D = Values DIM1
+type Values2D = Values DIM2
+type Values3D = Values DIM3
+
+
+instance Arbitrary Values3D where
+ arbitrary = do
+ -- I declare not to care about empty lists.
+ x_dim <- choose (1, 27)
+ y_dim <- choose (1, 27)
+ z_dim <- choose (1, 27)
+ elements <- vectorOf (x_dim * y_dim * z_dim) (arbitrary :: Gen Double)
+ let new_shape = (Z :. x_dim :. y_dim :. z_dim)
+ let three_d = Data.Array.Repa.fromList new_shape elements
+ return three_d
+