Hi everyone,

has anyone read the code of the function igraph_rewire_edges?


i'm doing this because i wonder why this function rewires a large network so 
fast. 


it seems some indexing technique is used, because i have seen in the function 
igraph_i_rewire_edges_no_multiple in games.c, some vectors such as first, next, 
prev are used. 


though i tracked the code with a small network of 5 nodes and 6 edges, i still 
don't understand the meaning of the three vectors. How do they work, please?


Thanks a lot!


Gang Lu
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