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To access these problems, link your MathWorks Account to your course in Course Site. You can find this link at the bottom of the Add Problem page.
Grading
Currently, MATLAB Grader only provides problem-level scoring - it does not support multi-problem assignment level scoring. One workaround for this is to and use the gradebook setup in Course Site to aggregate the scores from multiple problems and assign your own points/rubrics at an assignment level. You can learn more about configuring your Course Site gradebook here: Course Site - Gradebook
For more information on creating problems and assessments with MATLAB Grader, please see the documentation on the MathWorks site: https://www.mathworks.com/help/matlabgrader/index.html