ex_6.m

信号与系统分析以matlab实现

%画例6.5的程序
syms t
f=sym('(t/2+1)*(heaviside(t+2)-heaviside(t-2))')
subplot(2,3,1),ezplot(f,[-3,3]),title('f(t)')
y1=subs(f,t,t+2)
subplot(2,3,2),ezplot(y1,[-5,1]),title('f(t+2)')
y2=subs(f,t,t-2)
subplot(2,3,3),ezplot(y2,[-1,5]),title('f(t-2)')
y3=subs(f,t,-t)
subplot(2,3,4),ezplot(y3,[-3,3]),title('f(-t)')
y4=subs(f,t,2*t)
subplot(2,3,5),ezplot(y4,[-2,2]),title('f(2t)')
y5=-f
subplot(2,3,6),ezplot(y5,[-3,3]),title('-f(t)')