matlab循环子矩阵

假设您的矩阵被调用 M :

for num = 1:99
    %Extract only rows that have the correct number in column one
    subsample = M(M(1, :) == num, :);
    %Randomly change the order of the rows of this subsample
    shuffledsubsample = subsample(randperm(1200), :);
    %Only keep the first 900 rows
    final(:,:,num) = shuffledsubsample(1:900, :);
end