MATLAB: How get the Adjacency matrix from complete graph

adjacency graphgraphmathematics

Hi I need get the Adjacency matrix from this code
% Complete Graph
% N no Nudes
% E = edges
n = input('Give Number Nudes: ');
E = (n*(n-1)/2);
theta = linspace(0,2*pi,n+1).';
theta(end)=[]; % 0 = 2pi so...
r = n;
cor = [r*cos(theta) r*sin(theta)]; % x coordinates of points
axes('nextplot','add')
while size(cor,1) > 1
    cor_pt = repmat(cor(1,:),size(cor,1)-1,1); % point being connected to others
    cor(1,:) = [];
    for i = 1:size(cor_pt,1)
        line([cor_pt(i,1),cor(i,1)],[cor_pt(i,2),cor(i,2)],'marker','.','markersize',30)
    end
end

Best Answer

Its trivial:
A = ones(n) - diag(diag(ones(n)))
or, more easy
A = ones(n) - eye(n)
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