A fast algorithm to approximate the spectral density of locally tree-like networks with assortativity

Author:

Guzman Grover E C1,Fujita André1

Affiliation:

1. University of São Paulo Department of Computer Science, Institute of Mathematics and Statistics, , Rua do Matão, 1010, São Paulo, SP 05508-090, Brazil

Abstract

AbstractGraphs have become crucial for representing and examining biological, social and technological interactions. In this context, the graph spectrum is an exciting feature to be studied because it encodes the structural and dynamic characteristics of the graph. Hence, it becomes essential to efficiently compute the graph’s spectral distribution (eigenvalue’s density function). Recently, some authors proposed degree-based methods to obtain the spectral density of locally tree-like networks in linear time. The bottleneck of their approach is that they assumed that the graph’s assortativity is zero. However, most real-world networks, such as social and biological networks, present assortativity. Consequently, their spectral density approximations may be inaccurate. Here, we propose a method that considers assortativity. Our algorithm’s time and space complexities are $\mathscr{O}(d_{\max}^{2})$, where $d_{\max}$ is the largest degree of the graph. Finally, we show our method’s efficacy in simulated and empirical networks.

Funder

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Publisher

Oxford University Press (OUP)

Subject

Applied Mathematics,Computational Mathematics,Control and Optimization,Management Science and Operations Research,Computer Networks and Communications

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