Question

用MATLAB的向量表示法描述f(t)=cos(πt/2)[u(t)-u(t-4)]

Answer 1

t=-2:0.01:8;

f1=[zeros(1,length(-2:0.01:0)),ones(1,length(0.01:0.01:4)),zeros(1,length(4.01:0.01:8))];

f=cos(pi*t/2).*f1;

plot(t,f)

axis([-2,8,-2,2])