Matrix summation within a loop

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Keshav Dev Singh
Keshav Dev Singh 2012-2-18
Hello Friends, I want to solve "Phi=Summation((1/ai^2)*V(:,i)*U(:,i)') for loop range i=1:100". At every iteration Phi is a 100x500 huge matrix.
How such huge matrix summation problem can be solve?
Any and all replies are really appreciated!
~Keshav

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2012-2-18
Phi2 = zeros(size(V,2),size(U,1));
for j1 = 1:size(V,2)
Phi2(j1,:) = 1/ai^2*sum(V(:,j1)*U(:,j1).');
end
OR
without loop
Phi1 = 1/ai^2*sum(bsxfun(@times,permute(V,[2 3 1]),U.'),3)

更多回答（1 个）

Keshav Dev Singh
Keshav Dev Singh 2012-2-18
It's working. Thanks a lot Bobrov!
One think i m nt getting, whts is meaning of dot in "U." ?
Regards, KDSingh

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