朴素贝叶斯算法，以函数形式实现，花了一个上午的时间-Naive Bayes algorithm, in order to function the form of implementation, a morning flower time

This file conclude of five codes , four of them in Mathematica program and one in C++. 1. Erk4.nb. this code represent the explicit Runge Kutta method of order four for solving first order ODE. 2. RK45.nb This code represent the Embedded Runge Ku