1.示例
%第一题
clear;clc
t1=-0.5:0.01:2.5;
t2=-1:0.01:5;
f1=stepfun(t1,0)-stepfun(t1,2);
f2=0.5.*t1.*(stepfun(t1,0)-stepfun(t1,2));
f3=conv(f1,f2);
figure(1)
subplot(3,1,1)
plot(t1,f1)
title('f1')
subplot(3,1,2)
plot(t1,f2)
title('f2')
subplot(3,1,3)
plot(t2,f3*0.01)
title('f1卷积f2')
%第二题
f=exp(-3.*t1).*sin(8.*t1).*stepfun(t1,0);
h=exp(-2.*t1).*stepfun(t1,0);
f3=conv(f,h);
figure(2)
subplot(3,1,1)
plot(t1,f)
title('f')
subplot(3,1,2)
plot(t1,h)
title('h')
subplot(3,1,3)
plot(t2,f3*0.01)
title('零状态响应')
%第三题
t1=-2:0.01:2;
f1=stepfun(t1,0)-stepfun(t1,1);
f2=2*(stepfun(t1,0)-stepfun(t1,1));
f=conv(f1,f2);
figure(3)
subplot(3,1,1)
plot(t1,f1)
title('f1')
subplot(3,1,2)
plot(t1,f2)
title('f2')
t2=-4:0.01:4;
subplot(3,1,3)
plot(t2,f*0.01)
title('f')