谁能帮忙解释下setfield函数怎么用的啊,下面的例子看不懂啊
grades = [];
level = 5;
semester = 'Fall';
subject = 'Math';
student = 'John_Doe';
fieldnames = {semester subject student}
newGrades_Doe = [85, 89, 76, 93, 85, 91, 68, 84, 95, 73];
grades = setfield(grades, {level}, ...
fieldnames{:}, {10, 21:30}, ...
newGrades_Doe);
% View the new contents.
grades(level).(semester).(subject).(student)(10, 21:30)
fieldnames =
'Fall' 'Math' 'John_Doe'
ans =
85 89 76 93 85 91 68 84 95 73


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