function [] = my_gerschgorin_27_03(a)
%disegniamo i cerchi per righe
n=length(a);
for k=1:n
    r=0;
    for j=1:k-1
        r=r+abs(a(k,j));
    end
    for j=k+1:n
        r=r+abs(a(k,j));
    end
    my_circle_27_03(a(k,k),r,1000);
    hold on;
end
ee=eig(a);
plot(real(ee),imag(ee), 'd');
hold off
end