中文说明：一个简单的CART算法实现例子，可以帮助机器学习的初学者理解cart编程，这是找了好久的代码，在这里和大家分享一下，看过了之后对我很有用，我自己的代码会在以后上传
English Description：
A simple cart algorithm example, can help the machine learning for beginners to understand cart programming, which is to find the code for a long time, here and share with you, seen after is very useful to me. My own code will be uploaded in later