extract values and save them as unique txt files

Hi, I have a vector and what to extract the unique values of the first column and save those as separate txt file with the same ID as unique ID. Thanks a lot! For example A:

A dataset:

21  723204  12
21  723204  10.5000000000000
21  723204  13.5000000000000
21  723292  20
21  723356  21
21  723447  19
21  723483  17
21  723503  16
21  723503  11
22  723572  11
22  723594  12.5000000000000
22  723621  16.5000000000000
22  723663  16
23  723692  19
23  723720  26
23  723720  32
23  723783  22
%end

and result should be: 21.txt, 22.txt, 23.txt with e.g. 23.txt is:

723692  19
723720  26
723748  32
723783  22
and so on...(so without first column in the resulting txt file).

so far I did :

[C,ia,ic] = unique(A(:,1),'rows')
rows21 = A(C==21, :); % but I do not want to this separately since it takes a lot of time. I would like to do with for loop if possible so I create automatically txt files? thanks a lot!

Answer 1

[Image Analyst]

This works:

data = dlmread('text.txt')
% Get unique values in column 1
uniqueValues = unique(data(:, 1))'
for k = uniqueValues
  fullFileName = fullfile(pwd, sprintf('%d.txt', k))
  rowsToWrite = data(:, 1) == k;
  dlmwrite(fullFileName, data(rowsToWrite, 2:end), 'delimiter', ' ', 'precision','%g');
end

[sensation]

Thanks a lot!