Help plz for matlab

Simulating a Random Walk(Lets simulate a random walk process to verify the root-mean-square (RMS) expression)

Write a computer simulation (in MATLAB) that tracks the position of an interstitial atom that is diffusing in a simple cubic lattice with lattice parameter a = 3.5 . Assume hopping to each of the six neighboring interstitial positions is equally likely. Each simulation should track the position of an atom for n hops within the 3D lattice. At the end of these n hops, calculate the distance of the atom from the origin (RN) and the total distance traveled along the hopping path. Your code should run this individual simulation a total of M times, and the RMS distance (^1/2) should then be calculated from these M simulation