3. Cubic equation for four data in a rectangular array A cubic equation for eight data in prismatic array, as in Fig. 1, was illustrated several years ago. It is Eq. (1) in [3]. It is now used to generate a cubic equation
3. Cubic equation for four data in a rectangular array A cubic equation for eight data in prismatic array, as in Fig. 1, was illustratedseveral years ago. It is Eq. (1) in [3]. It is now used to generate a cubic equation