How can I simplify this For loop?

Question

Kenneth Wong 2015-11-4

0
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https://ww2.mathworks.cn/matlabcentral/answers/252631-how-can-i-simplify-this-for-loop

回答： Noam 2015-11-4

Hello. I am facing a problem running this code to completion as the size of T is very big (over a million rows). While the time taken to compute one iteration isn't very long (0.2118s); assuming 1 million data points, the code will still take 100,000s. Thank you for your help!

function Xout = selectpoints(T,Xin)
for k = 1 : length(T)
    dist = (Xin(:,1)-T(k,1)).^2 + (Xin(:,2)-T(k,2)).^2 + (Xin(:,3)-T(k,3)).^2;
    [~,ind] = min(dist);
    nearest(k) = ind;
end
Xout = Xin(nearest,:);