how to export a matrix

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hi all, i'm trying to export a matrix "f" that is double. My data in f are real numbers in three columns. I want a txt file as an output with the columns separated by tabs. but when I try dlmwrite function, just the first column appears as output.

for k = 1:10
f = [idx', firsttime', sectime'];
filename = strcat(('/User/Detection_rerun/AF_TIMIT/1_state/mergedlabels_train/'),(files_train{k,1}),'.lab');
 dlmwrite(filename,f,'\t') ;
end

when I write is as dlmwrite(filename,f,'\t','newline','pc') ; I keep getting an error Invalid attribute tag: \t . I even tried 'tab' instead of '\t' but a similar error appears. Please let me know if you have any suggestions. thank you