模糊聚类在荆条灌丛(Scrub. Vitex negundo var. heterophylla) 分类中的应用

 本文应用模糊聚类分析对荆条灌丛分类进行了研究。聚类过程可分为三步：1．计算相似矩阵R：这一步与其它聚类方法相同，相似系数可有各种选择。 2．寻找模糊等价关系，取R的乘幂 R2，R4，R8，…，若在某一步，有 R*便是一个模糊等价关系。3．聚类：选取适当的置信水平λ进行聚类。本文相似系数采用式中rjk代表二样方j和k的相似系数，M为一适当的常数，以使0

Application of Fuzzy Mathematics to Vegetation Classification of Scrub Vitex negundo var. heterophylla

In this paper, Fuzzy clustering analysis is used to study the scrub of Vitex negundo var. heterophylla. The procedure of this method is as follows:1. The calculation of similarity matrix R: This is the same as other approaches. Various similarity coefficients may be used here.2. The transformation of R to Fuzzy equivalent relation R*:Make R2,R4,R8, …, if RK=R2K △ R* then, R* is a fuzzy equivalent matrix.3. Clustering: select suitable values of λ and cluster accordingly. Establishing the similarity matrix R: let rjk=l-djk/M(j,k=l,2, 3, …41) where rjk is the similarity coefficient of both quadrants j and k; M, the proper constant chosen at will to make 0