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%% Graph Laplacian Matrix % Create a graph using an edge list, and then calculate the graph Laplacian % matrix. % Copyright 2015 The MathWorks, Inc. s = [1 1 1 1 1]; t = [2 3 4 5 6]; G = graph(s,t); L = laplacian(G) %% % The diagonal elements of |L| indicate the degree of the nodes, such that % |L(j,j)| is the degree of node |j|. % % Calculate the graph incidence matrix, |I|, and confirm the relation |L = % I*I'|. I = incidence(G); L - I*I'