·无尺度网络与随机网络的结构和特性差别很大。图A表示一个节点总数量为10,任何两个节点之间连接概率p=0.2的随机网络。因为10个节点可形成45个点对,所以这个网络最大的可能是形成9个连接。如图C所示,这种网络中节点的连接数k的概率分布P(k)符合泊松分布。图B表示一个无尺度网络,它通过增加新节点而不断扩张。旧节点(黑色)的连接数越大,与新节 Structure and characteristics of scale-free networks and random networks vary greatly. Figure A shows a random network with a total number of nodes of 10 and the probability of connection p = 0.2 between any two nodes. Since 10 nodes can form 45 pairs of points, the biggest possibility of this network is to make 9 connections. As shown in Figure C, the probability distribution P (k) of the number k of nodes in such a network complies with the Poisson distribution. Figure B shows a scale-free network that is constantly expanding by adding new nodes. Older nodes (black) the greater the number of connections, and the new section