1.4第二题

n1=-5:9;

n2=-6:9;

x1=[zeros(1,5),ones(1,10)];

x2=[zeros(1,4),ones(1,11)];

subplot(3,1,1);

stem(n1,x1,'b--^');

title('1.4(b)-1');

xlabel('n');

ylabel('x[n]=u[n]');

subplot(3,1,2);

stem(n1,x2,'m--h');

title('1.4(b)-2');

xlabel('n');

ylabel('x[n+1]=u[n+1]');

y1=[0 x1+x2];

subplot(3,1,3);

stem(n2,y1,'r--p');

title('1.4(b)-3');

xlabel('n');

ylabel('y[n]=x[n]+x[n+1]');

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