commGSP/commGSP_build_matrix.m
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commGSP_build_matrix.m
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			function X = commGSP_build_matrix(A, type)
			% Builds laplacian or modularity matrix given the graph's adjacency matrix
			% INPUT:
			% A - (symmetric) adjacency matrix
			% type - string equal to 'laplacian' for Laplacian matrix as output,
			% or 'modularity' for modularity matrix as output
			% OUTPUT
			% X - matrix of the graph

			N=size(A,1);
			k=A*ones(N,1);
			if strcmp(type, 'laplacian')
			X = sparse(diag(k) - A);
			else
			if strcmp(type, 'modularity')
			X = sparse(A - ( k*k')./sum(k));
			end
			end