Matrix summation within a loop
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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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Andrei Bobrov
2012 年 2 月 18 日
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)
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