说明：  由Cranfield大学的CaoYi教授编写的数独游戏。数独是风靡全球的智力游戏，本代码采用matlab实现基本的数独游戏功能。
(By the Cranfield University, prepared by Professor CaoYi Sudoku. Sudoku is a popular puzzle game around the world, the code using matlab to achieve the basic function of Sudoku game.)