[out]=graph_efficiency(G) 
 
 Latora V and Marchiori M 2001 Phys. Rev. Lett. 87 198701 
 
 The efficiency E[G] of a graph G is defined as: and measures the mean 
 flow-rate of information over G 
 

delta_centrality, graph_diameter, graph_clustercoeff, 
 graph_density 
 
 Systems Biology and Evolution Toolbox (SBEToolbox). 
 Authors: James Cai, Kranti Konganti. 
 (C) Texas A&M University. 
 
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