zhuchengfenfenxi.m

signal and system answer

clear
A=xlsread('zhuchengfenfenxi.xls');
B=zeros(1,4);
B=sum(A);
for i=1:4
    for j=1:4
        A(i,j)=A(i,j)/B(j);
    end
end
[pc,score,latent,tsquare]=princomp(A);
x=[0.1183 0.1121 0.9177 0.1755];
c=A(1,:).*x;
d=A(2,:).*x;
e=A(3,:).*x;
f=A(4,:).*x;
g=sum(c)
h=sum(d)
i=sum(e)
j=sum(f)
A