北理工信号与系统实验报告

（4） <1>

>> t=0:0.01:4; >> x1=-t+4;

>> x2=sin(2*pi*t); >> x3=x1+x2; >> plot(t,x3); >> grid on; >> xlabel('t'); >> title('x3(t)');

<2>

>> t=0:0.01:4; >> x1=-t+4;

>> x2=sin(2*pi*t); >> x4=x1.*x2; >> plot(t,x4); >> grid on; >> xlabel('t'); >> title('x4(t)');

<3>

>> t=0:0.01:4; >> x1=-t+4;

>> x2=sin(2*pi*t); >> t3=-t; >> x3=-t3+4; >> x5=x1+x3; >> plot(t,x5); >> grid on >> xlabel('t'); >> title('x5(t)');

<4>

>> t=0:0.01:4; >> x1=-t+4;

>> x2=sin(2*pi*t); >> t3=t-1;

>> x3=sin(2*pi*t3); >> x6=x2.*x3; >> plot(t,x6); >> grid on; >> xlabel('t'); >> title('x6(t)');