How To Calculate Double Summation In Matlb

Hey there,

I am trying to calculate C, as A=[1 2 3]; B=[1 2 3;4 5 6;7 8 9]; n=3

C=Sigma(i=1 to 3)Sigma(j=1 to3 )A(i)B (i,j)A(j)

Tell me Matlab code to calculate C. Thanks in advance

Answer 1

[Azzi Abdelmalek]

A=[1 2 3];
B=[1 2 3;4 5 6;7 8 9];
s=bsxfun(@times,bsxfun(@times, B,A),A');
s=sum(s(:))

[Zahid Iqbal Rana]

Thanks

[Hassan Abdelazeem]

clc

clear

A=[1 2 3];

B=[1 2 3;4 5 6;7 8 9];

for j=1:3

for i=1:3

c(i,j)=A(i)*B(i,j)*A(j);

end

end

c=sum(sum(c))