how to add to txt file from certain point

Question

Ilana 2013-8-5

0
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https://ww2.mathworks.cn/matlabcentral/answers/84079-how-to-add-to-txt-file-from-certain-point

Hi, I have a txt file which is a matrix [col1 col2 col3] (n rows) , i want to input a loop i=1:1:7 that will be added as a 4th col. [col1 col2 col3 1] [col1 col2 col3 2] [col1 col2 col3 3] so on until [col1 col2 col3 7] and then repeat itself until the n row, how can i do that?

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Answer 1

Cedric 2013-8-5

1
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https://ww2.mathworks.cn/matlabcentral/answers/84079-how-to-add-to-txt-file-from-certain-point#answer_93641

编辑：Cedric 2013-8-5

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One way would be the following:

 fid_in  = fopen('inFile.txt', 'r') ;
 fid_out = fopen('outFile.txt', 'w') ;
 cnt = 0 ;
 while ~feof(fid_in)
    if cnt == 7,  cnt = 1 ;  else  cnt = cnt + 1 ;  end
    fprintf(fid_out, '%s %d\r\n', fgetl(fid_in), cnt) ;
 end
 fclose(fid_in) ;
 fclose(fid_out) ;