怎么做,大神求救。用MATLAB绘制信号f(t)的波形,线性变换为f(t-4)和...答:f1=sym('t*(heaviside(t)-heaviside(t-1))');f2=sym('(heaviside(t-1)-heaviside(t-2))');f3=f1+f2;figure;subplot(311),ezplot(f3,[0,10]);title('f(t)');f4=subs(f3,t,t-4);subplot(312),ezplot(f4,[0,10]);title('f(t-4)');f5 = subs(f3,t,4-2*t);subplot(...