MATLAB Grader: What should my assessment return when it determines a student solution is correct or incorrect?

Question

M. E. Brokowski 2024-4-4，7:42

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2102761-matlab-grader-what-should-my-assessment-return-when-it-determines-a-student-solution-is-correct-or

编辑： Cris LaPierre 2024-4-8，12:47

Let's say the assignment is to create (and leave open) a figure with three subplots and one of the subplots should have the title "Oscillating Motion". I want to use an assessment of Test Type MATLAB Code to check the figure the student's code has created. I can easily check that using Matlab code similar to the following

% Get the handles of all subplots
axis_handles = findobj(gcf, 'type', 'axes');
% see if the title matches the requirement
set_required_title = false;
for axnum=1:length(axis_handles)
    title_str = get(get(axis_handles(axnum),'Title'),'String');
    set_required_title = set_required_title | strcmpi(title_str,'Oscillating Motion');
end

How do I return that result (the variable set_required_title) as an assessment test?

BTW, just for context of what I am talking about, in my LMS, this looks like

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Dyuman Joshi 2024-4-4，8:03

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2102761-matlab-grader-what-should-my-assessment-return-when-it-determines-a-student-solution-is-correct-or#answer_1436336

编辑：Dyuman Joshi 2024-4-4，8:05

You can use assert to check a condition (whether the title contains a particular text or not) and throw a (custom defined) error (like the one you have written - with subplot number added if you want to provide a specific error) when the condition is not satisfied.

5 个评论
显示 3更早的评论隐藏 3更早的评论

Dyuman Joshi 2024-4-4，9:56

It's linked to that page, yes.

As for on example, you can check the documentation page of assert, but thpse are not in the context of use in MATLAB Grader.

I can help you write one, if you could copy and paste the code you have posted in the image.

M. E. Brokowski 2024-4-4，10:17

Thanks, but I don't need any help writing the code. Cheers.

请先登录，再进行评论。

Answer 2

Cris LaPierre 2024-4-4，12:39

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2102761-matlab-grader-what-should-my-assessment-return-when-it-determines-a-student-solution-is-correct-or#answer_1436501

编辑：Cris LaPierre 2024-4-8，12:47

Please see this Answer: https://www.mathworks.com/matlabcentral/answers/548631-matlab-grader-determining-if-a-variable-is-a-function-handle#answer_451644

Your assessment must return an error if the answer is incorrect. Otherwise, it is considered correct. This is what assert, as well as the built-in assessment functions do.

2 个评论
显示无隐藏无

Cris LaPierre 2024-4-4，12:45

Since you are grading a plot, I suggest also looking at this answer. It shows how to build a more robust custom assessment test so that students alway receive meaningful feedback.

https://www.mathworks.com/matlabcentral/answers/1701790-how-to-check-plot-properties-for-multiple-lines-in-one-plot-grader#answer_947775

M. E. Brokowski 2024-4-7，17:09

Interesting. I had figured out how to check various things in the learner's figure. But, I did not know that the reference plot is closed/unavailable when the assessment test script runs.

请先登录，再进行评论。