  assc - calculate the assortative mixing parameter in Networks purposed by M.E.J. Newman
  attack - Simulate attack behaviors to the network model
  ba - create one normal BA scale-free network model
  ba_c - Calculate the expected cluster coefficient for BA model
  ba_l - Calculate the expected average distance of the BA model
  bbv - create the BBC weighted network model
  bet - calculate the betweenness centrality of nodes in graph
  cluster - calculate the cluster coefficient
  draw_degree - Display the degree distribution of the network
  draw_graph - Display the graph of the network using the layer method
  eff - Calculate the efficiency of the network
  er - create the ER random graph
  heter_et - calculate the expected epidemic transition of heterogeneous model such as BA and BBV model, etc.
  homo_et - calculate the expected epidemic transition of homogeneous models such as WS and ER model.
  nw_c - Calculate the expected cluster coefficient for NW small world
  sba - create the derivational BA model with arbitrary attractiveness, fitness and nonlinear attachment probability.
  scidecom - calculate the community structure of the network
  sirs - the susceptible-infected-rescued-susceptible (SIRS) model
  sis - the susceptible-infected-susceptible (SIS) model.
  tran - translate the head and tail of graph into the matrix G structure like the adjacency link
  ws - create the WS small world model
  ws_c - Calculate the expected cluster coefficient for WS small world
  ws_l - Calculate the expected average distance of the WS model