绪论
小世界实验:
Milgram的六度分离
Kevin Bacon游戏。Bacon数
Erdos数。
平均路径长度:average path length
聚类系数:clustering coefficient
度分布:degree distribution
任意两个节点的距离的最大值:D:直径。
平均长度:L=1/(1/2N(N+1))sigmaDij
朋友关系网中,你的两个朋友可能彼此也是朋友,这种属性称为网络的聚类特性。
k个节点之间最多可能有k(k-1)/2
实际含有的边数Ei和总的可能的边数的比定义为聚类系数Ci
Ci=2Ei/(Ki(Ki-1)):2是分母的。
与i相连的三角形的数量/与i相连的三元组的数量
三元组是包括i在内的三个节点,并至少存在从i到其他两个顶点的两条边。
网络的聚类系数是所有节点的聚类系数的平均值。sigmaCi/n
在社会网络中:N->无穷,C=O(1),物以类聚,人以群分。
直观上,一个节点的度越大说明在某种意义上越“重要”
平均度<k>
P(k)度的分布函数,随机选一个节点的度恰好为k的概率。
许多实际网络的度分布用幂率分布p(k)OOK-y,无标度分布。
非均匀网络,度很高的节点-集线器
高速公路-随机网络-均匀网络。
航空网-非均匀网络
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