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How to reassign values to new array without using a loop

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Master Yoda
Master Yoda 2021-2-24
评论： Master Yoda 2021-2-24
I am trying to reassign values to a new matrix as a method of cleaning up / bookeeping / decreasing memory. My current code is as follows.
for i = 1:N,
newMat(i,:) = oldMat(dataVec1 == dataVec2(i), :);
end
This loop takes FOREVER to do as N is very large and length(dataVec1) > N. Is there a way to avoid a for loop to achieve this? I have tried using bsxfun, but the intermediate matrix far exceeds memory.

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David Hill
David Hill 2021-2-24
[~,idx]=ismember(dataVec2,dataVec1);
newMat=oldMat(idx,:);

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