function G = edges2graph(E,nnodes)
%EDGES2GRAPH Create an undirected, simple graph from edge list. % % G = EDGES2GRAPH(E) creates an adjaceny matrix for the graph where % E(k,1) and E(k,2) specifies the kth edge. All edges are treated as % undirected. Duplicate edges are removed. Loops are removed. % % G = EDGES2GRAPH(E,N) specifies the number of number of nodes in the % graph. % % Tamara G. Kolda, Ali Pinar, and others, FEASTPACK v1.1, Sandia National % Laboratories, SAND2013-4136W, http://www.sandia.gov/~tgkolda/feastpack/, % January 2014
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if ~exist('nnodes','var') nnodes = max(E(:)); else % Error checking only tmp = max(E(:)); if (tmp > nnodes) fprintf('Highest index in E is %d, but N = %d', tmp, nnodes); end end ii = E(:,1); jj = E(:,2); G = spones(sparse([ii;jj],[jj;ii],1,nnodes,nnodes)); G = spdiags(zeros(nnodes,1),0,G);