function [A] = graph2A(E)
% GRAPH2A [A] = graph2A(E)
% computes the sparse representation of a graph whose edges are E
% where
% E is an e by 2 matrix
%
% makes sure A is symmetric
%
% Dan Spielman and Shanghua Teng, 1996
% Copyright (c) UC Berkeley/MIT/UMN. All rights reserved.
i = E(:,1);
j = E(:,2);
ii = [i;j];
jj = [j;i];
s = ones(size(ii));
A = sparse(ii,jj,s);
%A = sparse(i,j,s);
A = (A + A') > 0;