1.5第三题

n=0:1:30;

x1=n>=0;

x2=2.*x1;

a=1;

yn1=-1;

y1=diffeqn(a,x1,yn1);

y2=diffeqn(a,x2,yn1);

y3=2.*y1-y2

subplot(1,2,1);

stem(n,y1,'r--p');

xlabel('x1[n]=u[n]');

subplot(1,2,2);

stem(n,y2,'m--s');

xlabel('x2[n]=2*u[n]');

figure(2);

stem(n,y3,'^');

xlabel('2*y1[n]-y2[n]');

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