students_calc.m

function students_calc(data_vec) 
    mean_grades = mean(data_vec(:).grades, 1);
    file_data = [data_vec(:).name, data_vec(:).surname, mean_grades];

    file = fopen('student_mean.txt','w');
    fprintf(file,'%s %s %f\n', file_data);
    fclose(fileID);

    [argvalue, argmax] = max(mean_grades);
    best_student_name = data_vec(argmax).name;
    best_student_surname = data_vec(argmax).surname;

    print_data = [argvalue, best_student_name, best_student_surname];
    fprintf('Mathitis me ton megalytero meso oro(%f): %s %s', print_data);
end