Random Walk, Laplace Equation, Poisson Equation, Brownian Motion, Maxwell Boltzmann.
starting position vector ‘v’ and ‘delta_t’ as inputs. An exit position is determined by successive generations of a 2-dimensional binomial random vector. The ‘delta_t’ determines a grid width of the random walk process. Since a random walk trace may take too long in some cases, the ‘numba’ library