Data Set III. Sphere

r = 40; n=500;

S2 = randn(3,n)';

for i = 1:n;

S2(i,:) = r*(S2(i,:)./norm(S2(i,:)));

end

X = S2;

GD=zeros(n);

for i =1:n

for j=1:n

GD(i,j)=(2*r*asin( 0.5*( norm( X(i,:)-X(j,:) ) )/r ))^2*(1+0.2*randn);

end

end