How to Delete certain rows in a Matrix

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Grant Poggenpohl 2020-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/504059-how-to-delete-certain-rows-in-a-matrix

评论： dpb 2020-2-6

I have a matrix that is 2 columns wide and 18,000 rows long. I wish to save the first 15 rows, then delete 90, save 15 more and remove 90 more rows. and so on until the matrix is completed. I am having trouble with this. should i use loops?

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Answer 1

dpb 2020-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/504059-how-to-delete-certain-rows-in-a-matrix#answer_414142

编辑：dpb 2020-2-6

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Use indexing expressions...

N1=15;                                        % number to save
N2=90;                                       % number to skip
i1=1:N1+N2:size(x,1);                         % locations to begin to save
i2=N1:N1+N2:size(x,1);                        % end locations to save
ix=cell2mat(arrayfun(@colon,i1,i2,'uni',0));  % the addressing vector of those to save
M=M(ix,:);                                    % select the desired rows only