GMDHann

代码说明：

  matlab中是没有GMDH神经网络工具箱的，好多书籍中也没有代码，本人编写了一个，望对读者有用，记者把里面的函数分开写成一个个的m文件(There is no GMDH neural network toolbox of matlab, a lot of books in no code, I wrote a, hope is useful to the reader, the reporters to separate the function inside the written one m files)