AbstractPolicy.m debug warning

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kloner 2021-7-2

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https://ww2.mathworks.cn/matlabcentral/answers/870663-abstractpolicy-m-debug-warning

编辑： kloner 2021-7-7

Hi there,

Could someone please explain what the following debug warning in AbstractPolicy.m means?

% DEBUG: limit to scalar policies only. To step multiple

% policies caller may use loops.

assert(isscalar(this));

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Answer 1

Yongjian Feng 2021-7-2

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Hello kloner,

Basically it means that 'this' can not be an array. It must be a scaler. As explained in the comment, if you have an array, then just loop through the array and call the function for each element in the array.

Thanks,

Yongjian

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kloner 2021-7-2

编辑：kloner 2021-7-2

Dear Yongjian,

This explanation does not make a lot of sense to me as "this" refers to an rlQAgent (in the step method). I only have one agent, so how could I be failing on this error?

Thanks very much for the help.

Yongjian Feng 2021-7-2

What is an riQAgent?

You can also do these to narrow it down:

If you run this from the debugger, set a break point there, and type isscalar(this) in the command line window.
type class(this) to make sure it is indeed riQAgent.
type which isscalar to check if it is the built-in isscalar being called.

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Answer 2

kloner 2021-7-4

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Dear Yongjian,

An rlQAgent is a MATLAB-provided Reinforcement Learning agent, as described here: https://www.mathworks.com/help/reinforcement-learning/ref/rlqagent.html.

Apologies for any confusion: I thought that the context would be clear based on the information I originally submitted. I hope that this clarification provides sufficient information to explain the Debug message as originally alluded to. Thanks.

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kloner 2021-7-6

编辑：kloner 2021-7-7

Dear Yongjian,

I specifically hoping that someone could explain what a debug message found within AbstractPolicy.m, which is a file created by the MATLAB core team, meant. The warning does not appear when I call the file but is located specifically within the file itself.

Yongjian Feng 2021-7-7