How do I format a .txt file I've created?

Im trying to display max_speed for 6 different satellites in a .txt file, however when i run this code only sat_id appears, not max_speed. Can someone help me fix this?

    fileID=fopen('report.txt','w');
fprintf(fileID,'name\n');
fprintf(fileID,'studentnumber\n');
fprintf(fileID,'sat_id,max_speed(m/s),min_speed(m/s),orbital_period_before(s),orbital_period_after(s)\n');
for n = 1:6
fprintf(fileID,'%d\n', stat(n).sat_id);fprintf(fileID,'%15:9e %15:9e\n', stat(n).max_speed);

end fclose(fileID);

end

Answer 1

[Stephen23]

%15:9e

is not a valid format string. Perhaps you meant to write a decimal point:

%15.9e