ex_3.m

信号与系统分析以matlab实现

%P212 1
%(1)
syms t w
f1=sym('t*exp(-2*t)*Heaviside(t)');
F1=fourier(f1)
figure(1)
subplot(2,1,1),ezplot(f1)
subplot(2,1,2),ezplot(abs(F1))
f2=sym('Heaviside(t)-1')
F2=fourier(f2)
Fw=subs(F2,w,[-2*pi:0.1:2*pi]);
figure(2)
plot([-2*pi:0.1:2*pi],abs(Fw))