说明：   小波分解详细过程源码。此代码由本人将网上下载的程序改进了一下，并加了例子。其功能与matlab自带的函 数wavedec一致，由于自带的函数理解比较困难不方便改进，我改的程序简洁，方便大家理解该函数的意义和原理。
(This code will be downloaded from the program, I improved a bit, and added examples. Its function with matlab built-in function wavedec the same, due to built-in function is more difficult to understand inconvenient to improve, I changed the program is simple for everyone to understand the meaning of the functions and principles. )