In order to dealing with the clustering considering the condition of planar adjacency relationship, the concept adjacency matrix is defined.

面对满足二维空间邻接条件的聚类问题，定义了邻接矩阵的概念。

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In this paper, we get the diameter of three kind of self-complementary and then give a necessary and sufficient condition from matrix adjacency when the diameter is 2 or 3.

本文给出了三种类型的自补图关于直径方面的结果，并从自补图的邻接矩阵给出了自补图直径为2或3的一个充要条件。

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