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on 9 Oct 2021
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m=4;
A=companion(4+randi(m));
I=eye(4+randi(m));
B=companion(4+randi(m));
K=kron(A,kron(I,B));
e=eig(K);
e=e-round(e);
plot(e,'.')
axis square
function C=companion(p)
a=1;
for j=1:p
a=conv(a,[1 0 -1]);
end
m=2*p;
C=[-a(2:m+1); eye(m-1,m)];
end
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