DDA simulations and semi-analytical model for electrostatic polarizability of cubes and spheres

Data for the paper "Electromagnetics of deeply subwavelength metamaterial particles". The paper deals with magnetostatic problem; however, it is fully equivalent to electrostatic one. The record contains two parts, more details are given in the attached README.md: dda - DDA simulations for cubes and spheres using ADDA v.1.5.0-alpha. hp_model - semi-analytical model for polarizability of a cube in quasi-static limit, based on (Helsing & Prefekt 2013).