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How to select rows in a matrix with a for loop?

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Shayma Al Ali
Shayma Al Ali 2020-12-13
回答： Ameer Hamza 2020-12-13
I have a 3061x107 matrix. I want to reduce it to a 817x107 matrix. My current code currently saves what I want as a new matrix into a very large column so its 87000x1.
My current code:
density=[];
for i=1:length(densityt)
dcol=densityt(:,i);
dcol=dcol(1:817,:);
density=[density;dcol];
end

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Ameer Hamza
Ameer Hamza 2020-12-13
Following code is more efficient and outputs what you want
density = densityt(1:817, :)

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