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

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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

Accepted Answer

Dyuman Joshi
Dyuman Joshi on 4 Apr 2024
Edited: Dyuman Joshi on 4 Apr 2024
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 Comments
Dyuman Joshi
Dyuman Joshi on 4 Apr 2024
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.

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More Answers (1)

Cris LaPierre
Cris LaPierre on 4 Apr 2024
Edited: Cris LaPierre on 8 Apr 2024
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 Comments
M. E. Brokowski
M. E. Brokowski on 7 Apr 2024
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.

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