How to call columns of matrices using 'for loop' ?
2 views (last 30 days)
Show older comments
Hello,
I am new to MATLAB, can anyone tell me how can I use for loop for the following formulas?
Approx1=U(:,1)*S(1)*V(:,1)';
Approx2=U(:,1)*S(1)*V(:,1)'+ U(:,2)*S(2)*V(:,2)';
Approx3=U(:,1)*S(1)*V(:,1)'+ U(:,2)*S(2)*V(:,2)'+ UU(:,3)*S(3)*V(:,3)';
where U is 6 x 3, S is diagonal (3 x 3) and V is a 3 x 3 matrix. 1, 2 3 are being the columns of respective matrices.
Thank you
8 Comments
Matt J
on 15 Apr 2021
I want to Multiply first coulmn of U, S and V' matrices and then multiply second coulms of U, S and V' matrices
No, you can't because the columns of all these matrices have different lengths. You therefore cannot multiply their columns together.
Aren't you simply doing KL-transforms with different truncations? If so, that is what my answer below gives you, (and you should Accept-click it).
Accepted Answer
More Answers (1)
David Hill
on 15 Apr 2021
s=diag(S);
for i=1:3
Approx(:,:,i)=U(:,i)*V(:,i)'*s(i);%I am assuming this is what you want, s(i) being scalar along the diagonal
end
Approx=cumsum(Approx,3);
6 Comments
David Hill
on 15 Apr 2021
Hopefully you realize that S(1) is scalar and the first element in the diagonal matrix, S(2) will be zero, and S(3) will be zero. You are not multiplying by the column of S. The below produces the same result as expected.
for i=1:3
Approx(:,:,i)=U(:,i)*V(:,i)'*S(i);
end
Approx=cumsum(Approx,3);
See Also
Categories
Find more on Loops and Conditional Statements in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!