calc_X                  Construct and Classify a Quadratic-Response
                        Grid
coef_to_cbQ             Convert coefficient vectors to OptOR quadratic
                        functions
find_extrema            Find extrema of a quadratic fct on a
                        hyperrectangle
lm_to_cbQ               Convert fitted linear models to OptOR quadratic
                        functions
optimal_cont_hr         Compute inner and outer continuous operating
                        rectangles
optimal_grid_hr         Find an optimal hyperrectangle in a binary grid
