--- positive number h. The function values are the values of the
--- function at the grid points, which are distance h from one
--- another in each direction (x,y,z).
-data Grid = Grid { h :: Double, -- MUST BE GREATER THAN ZERO!
- function_values :: Values3D }
+-- positive number h, which we have defined to always be 1 for
+-- performance reasons (and simplicity). The function values are the
+-- values of the function at the grid points, which are distance h=1
+-- from one another in each direction (x,y,z).
+data Grid = Grid { function_values :: Values3D }