The \n doesn't work in Matlab when i write the datestring in file-CodePudding

I have a problem with \n when I am trying to write a datestring and number values in txt file

pattern = [ ...
     'Date %s - First %d \n', ...
    'Date %s - Second %d \n' ...
    '%d, \n', ...
    '*ENDDO\n\n'];

t = datetime('now');
[fid, msg] = fopen('date_and_values.txt', 'wt');
assert(fid ~= -1, 'Cannot open file %s: %s', 'долбоеб.txt', msg);
formatOut='dd.mm.yy';
dateString = datestr(t);
disp(dateString);
formatNumb = '\t%d';

res = [dateString num2str(1,formatNumb)  num2str(2,formatNumb)];
 for k = 1:17
     fprintf(fid, pattern, res);
%     % Perhaps this is faster:
%     % fwrite(fid, strrep(pattern, '%d', sprintf('%d', k)), 'char');
 end
fclose(fid);

I want the data looks like this:

The data i want to look like

But instead I get data in file look like this:

The data i get

What am I doing wrong?

CodePudding user response：

Change pattern to

pattern = ['Date %1$s - First %2$d \n', ...
           'Date %1$s - Second %3$d \n\n'];

and use

fprintf(fid, pattern, dateString, num2str(1,formatNumb), num2str(2,formatNumb));

instead, you will get the desired output.

Note the use of identifiers in the above. (ctrl F "identifiers" in documentation.) Without identifiers, each time you have a new formatting operator, a new input is expected by fprintf(). On top of that, every uniquely identified operator in your pattern should correspond to 1 input in fprintf().

(The pattern in OP also contains some superfluous trailing bits that are not found in the example output.)

CodePudding user response：

I don't know if I understand what you are looking for, but, have you tried this?

res = [dateString num2str(1,formatNumb)  num2str(2,formatNumb) '\n'];