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拓展学习

例1  2,0;2,-4,1;1,1,-6];

S=[1,2;2,3];

A=[R,zeros(3,2);zeros(2,3),S];

[X1,d1]=eig(R)

[X2,d2]=eig(S)

[X3,d3]=eig(A)

例2

x=[0,0.5,0.5,3,5.5,5.5,6,6,3,0;0,0,6,0,6,0,0,8,1,8];

A=[1,0.5;0,1];

y=A*x;

subplot(2,2,1);

fill(x(1,:),x(2,:),'r');

subplot(2,2,2);

fill(y(1,:),y(2,:),'r'); 

R=[-1,