que1cdzhishujianyan.m

signal and system answer

clear
load que1cdzhishujianyan
yt=zeros(1,44);
for i=1:44
    yt(i)=acd(i)+bcd(i)+ccd(i);
end
at=cdnihemean-yt;
pt=at./cdnihemean;
ap=1-1/length(yt)*sum(abs(pt));
rmse=sqrt(1/length(yt)*sum(at.^2));