extract every tenth row from a long text file with 3 column

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Akim Mahmud 2017-12-20

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评论： Akim Mahmud 2017-12-20

Hi I have a big text file with like 1000000 rows and 3 column and I imported using the importdata function. Now I want to extract/read only every 10th row from the file using a loop. Any help ? Thanks

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Answer 1

Image Analyst 2017-12-20

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https://ww2.mathworks.cn/matlabcentral/answers/373801-extract-every-tenth-row-from-a-long-text-file-with-3-column#answer_297049

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You forgot to attach the file, but basically I'm guessing you'd do:

data = importdata(filename);
% Non-loop way:
data10 = data(1:10:end, :);
% Loop way
[rows, columns] = size(data);
data10 = zeros(ceil(rows/10), columns);
thisRow = 1;
for row = 1 : 10 : rows
    data10(thisRow, :) = data(row, :);
    thisRow = thisRow + 1;
end