Convert Adjacency list of graph into Adjacency matrix
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I am working with Adjacency lists of a graph with 198 vertices and 2472 edges. How can I construct adjacency matrix of graph in Matlab?
Thank you for any help
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Steven Lord
le 17 Oct 2018
How is your data stored?
Do you have a matrix or two vectors containing the endpoints of the edges? In this case you can use sparse or accumarray as Bruno suggested.
Is your data stored in a different way? If so, describe your storage system and we may be able to offer some guidance.
Guillaume
le 17 Oct 2018
One possible way to read your file:
lists = strsplit(fileread('list.txt'), {'\r', '\n'});
if isempty(lists{end}), lists = lists(1:end-1); end
lists = cellfun(@(v) sscanf(v, '%d'), lists, 'UniformOutput', false);
adj = sparse(repelem(1:numel(lists), cellfun('length', lists)), vertcat(lists{:}), 1)
If you want a full matrix:
full(adj)
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