option to stop printing the results in an output file

Hi! I am working on a matlab code that contains many functions. In each mfile I inserted a fprintf to print the results in a file that I called output file. I want to run some simulations but I must insert in all the .m files an option to not print out the output in that file (else with many simulations it won't work to keep adding to the output file). What option must I add? I appreciate your fast reply!

Best regards, Alaa

[Jan]

"Fast reply"?! We are volunteers. Any pushing is futile.

Answer 1

[Jan]

You can create a dedicated function for the output:

function myFprintf(varargin)
persistent FID
cmd = vargargin{1};
if strcmp(cmd, '$open')  % Or what ever
  FileName = varargin{2};
  FID = fopen(FileName, 'w');
  if FID == -1
     error('Cannot open file: %s', FileName);
  end
  fprintf(1, '==> File opened for writing: %s\n', FileName);
  return;
elseif strcmp(cmd, '$close')  % Or what ever
  if FID ~= 0
    FileName = fopen(FID);
    fprintf(1, '==> Close file: %s\n', FileName);
    fclose(FID);
  end
  FID = 0;
  return;
end

if FID ~= 0
  fprintf(FID, varargin{:});
else
  fprintf(1, varargin{:});  % Write to command window instead?!
end

Now a leading myFprintf('$open', fullfile(Folder, File)) opens a file an all following calls are written to this file. But myFprintf('$close') closes the file and subsequent calls avoid writing to the file.

Now you have to find and replace the existing fprintf calls to myFprintf (or a nicer name...).