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

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Christopher Maraj
Christopher Maraj 2018-3-18
编辑： Stephen23 2018-3-18
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

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Stephen23
Stephen23 2018-3-18
编辑：Stephen23 2018-3-18
%15:9e
is not a valid format string. Perhaps you meant to write a decimal point:
%15.9e

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