MATLAB: How to write an array and a string to a text file

formatfprintftext file

Hi,

I have an array of numbers that I need to export to a text file, but I also need to add the sting '0 to the end of each number. I have tried using the fprintf command but can't get the formating correct.

For example, if the array was:

   1 2 3 4 5 
   1 2 3 4 5 
   1 2 3 4 5

I need to have a text file that reads:

   1'0 2'0 3'0 4'0 5'0
   1'0 2'0 3'0 4'0 5'0
   1'0 2'0 3'0 4'0 5'0

Thanks for your help!

Best Answer

Try this:

fprintf('%d''0, %d''0, %d''0, %d''0, %d''0\n', m');

where m is your matrix.

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MATLAB: Exporting to text file – adding a header

x = [1:5];
y = rand(1,5);
fileID = fopen('yourfile.txt','w');
fprintf(fileID,'your text\n')
for i = 1:length(x)
  fprintf(fileID,'%s\t%d\t%d\t%f\n', 'Test', x(i),x(i),y(i));
end
fclose(fileID);

MATLAB: Reduce trailing zeros of text file

Here's how you use fprintf to export two integer columns followed by three floating point columns:

% Create array with 5 columns and integers in first two columns
x = rand(50, 5) * 100;
x(:, 1:2) = floor(x(:, 1:2))
% Create output text file
fid = fopen('myfile.txt', 'w');
% Write data to file, note:
% - This string exports two integers (%d) followed by three floating point numbers (%f)
% - The numbers are separated by tabs (\t)
% - \n puts a return at the end of each line
fprintf('%d\t%d\t%f\t%f\t%f\n', x');
% Close file
fclose(fid);

This works because in MATLAB fprintf can process arrays. If the array is longer than format string expects, it keeps repeating the format string until the entirety of the array can be printed.

One more note, fprintf linearalizes multi-dimensional arrays. If your data is stored in MATLAB in rows, you'll want to transpose it (as I did in the example) since files are written by rows.

Best Answer

Related Solutions

MATLAB: Exporting to text file – adding a header

MATLAB: Reduce trailing zeros of text file

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