Identifying influential nodes based on graph signal processing in complex networks*
Zhao Jia, Yu Li†, Li Jing-Ru, Zhou Peng
       
Example of the Zachary club network. After an overall evaluation of each node, the Zachary club network can be represented as a graph with node signals on it. There is no signal on the black nodes. Red means negative signal, while blue means positive signal. The height is the absolute value of each signal.