How can I split a file at defined intervals into multiple files?

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Max90 2021-8-16

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https://ww2.mathworks.cn/matlabcentral/answers/916497-how-can-i-split-a-file-at-defined-intervals-into-multiple-files

评论： Max90 2021-8-18

采纳的回答： Wan Ji

test.txt

Hi Matlab Community,

I am trying to split a file (see example included) at defined line intervals, e.g. every 4th line and safe the sequence of lines in a new file with increasing numbers in the filename. For example, I am trying to split a file with 40 lines of text into 10 files with 4 lines each and name the resulting files 1.txt, 2.txt, 3.txt. etc.

I have not included code as my attempts have not resulted in anything useful.

I am very grateful for any help and suggestions how to achieve this.

Thank you,

Max

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采纳的回答

Wan Ji 2021-8-17

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https://ww2.mathworks.cn/matlabcentral/answers/916497-how-can-i-split-a-file-at-defined-intervals-into-multiple-files#answer_768437

编辑：Wan Ji 2021-8-17

在 MATLAB Online 中打开

s = fileread('test.txt'); % read files to string s
k = find(s==newline); % find newline position
s = mat2cell(s,1, diff([0,k(4:4:end-1),numel(s)])); % split with every 4 newlines
fid = arrayfun(@(i)fopen([num2str(i),'.txt'], 'wt'),1:1:numel(s)); % get the fid
arrayfun(@(i)fprintf(fid(i),'%s',replace(s{i},newline,'')),1:1:numel(s)); % write to 1.txt 2.txt...
arrayfun(@(i)fclose(q(i)),1:1:numel(s));% close files