Problem in understanding Bayes Classifier.

Hai friends, i have a code foe Bayes classifier. Even though everything is explained regarding how to give input, i am totally confused and not able to understand it. I am using it for two-classes.

I have attached the links where you can find example programs and the code which which i have to use for my data. May please help me out if you had worked with that ? links : https://bbhatpramod.wordpress.com/2012/03/10/example-program-2/ , https://bbhatpramod.wordpress.com/2012/03/10/programs-to-be-used/ The code was given in the book Introduction to Pattern Recognition : A MATLAB Approach. 2010 S. Theodoridis, A. Pikrakis, K. Koutroumbas, D. Cavouras