Question

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f(-2t+4) ，画波形图。

Answer 1

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(313),ezplot(f5,[0,10]);

set(gca,'Ylim',[0,1.2]);

title('f(-2t+4)');