1;
A=eye(5,5)

      A(1,1)=4.87;
      A(1,2)=A(2,1)=9.10;
      A(1,3)=A(3,1)=0.34;
      A(1,4)=A(4,1)=7.22;
      A(1,5)=A(5,1)=23.49;

      A(2,2)=2.41;
      A(2,3)=A(3,2)=5.04;
      A(2,4)=A(4,2)=8.95;
      A(2,5)=A(5,2)=1.47;

      A(3,3)=3.54;
      A(3,4)=A(4,3)=1.90;
      A(3,5)=A(5,3)=6.59;

      A(4,4)=7.43;
      A(4,5)=A(5,4)=100.67;

      A(5,5)=40.42;

eig(A)

B=[[1,0,2];[0,2,1];[2,1,3]]
eig(B)

B=[[1,-2,0];[-2,7,5];[0,5,-3]]
eig(B)
