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[igraph] Fw: why is igraph_rewire_edges so fast?

From: sizheng0320
Subject: [igraph] Fw: why is igraph_rewire_edges so fast?
Date: Mon, 14 Dec 2015 11:47:31 +0800

Hi, Gabor,

is there any docs about the algorithms used by igraph_rewire_edges, please?

I'm interested in the indexing technique used in igraph_i_rewire_edges_no_multiple which makes the rewiring so fast.

Thanks a lot!

Gang Lu

------------------ Original ------------------
From:  "sizheng0320";<address@hidden>;
Date:  Fri, Dec 11, 2015 12:28 PM
To:  "igraph-help"<address@hidden>;
Subject:  why is igraph_rewire_edges so fast?

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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