说明：  第一种形式的C均值算法进行聚类，并作图显示。可以通过分别改变类别数量和初始聚类中心（控制变量法）来获得不同的结果。
(The first form of c-means clustering algorithm, and show the graph. Different results can be obtained by changing the number of categories and the initial clustering center (control variable method).)