简明扼要介绍k均值算法使用方法及注意事项，有利于初学者学习-A concise introduction to the use of methods and precautions k-means algorithm, beneficial for beginners to learn

关于二维傅里叶变换的介绍，适合初学者学习。里面有详细的算法与程序设计-Two-dimensional Fourier transform of the introduction, suitable for beginners to learn. There are detailed algorithm and program design