Write a function called checkerboard that takes as input two positive integer scalars, n and m, in that order. The function must create and return board, which is an n-­‐by-­‐m matrix. Every element of board is either 0 or 1. The first element, board(1,1) is 1. No direct neighbors in the matrix, vertically or horizontally, can be equal. That is, a 1 element cannot have 1 immediately preceding or following it in the same row or column.

function board = checkerboard(n,m)
board = zeros(n,m);
board(1:2:n,1:2:m)=1;
board(2:2:n,2:2:m)=1;