说明：  尽管matlab提供了朴素bayes的函数，但要理解朴素bayes还是自己编程实现为好。这是以IRIS数据集为例，用朴素bayes方法分类的程序。
(Although matlab Bayes provides a simple function, but to understand the simple Bayes or programming for their own good. This is the IRIS data set as an example, naive Bayes method with a classification procedure.)