中文说明：这是张德丰老师matlab第二版书上的源代码，对应于书的每一节的内容。从第一章到第九章，应有尽有，样样俱全，放在matlab里面可以直接运行，第代码详细而充实，非常适合用matlab实现小波变换的初学者练习和学习。
English Description：
This is the source code of the second edition of MATLAB, corresponding to the content of each section of the book. From the first chapter to the ninth chapter, there are all kinds of things, which can be run directly in MATLAB. The third chapter code is detailed and substantial, which is very suitable for beginners to practice and learn wavelet transform with MATLAB.