Why I keep receiving this message: "For deep learning, the simulation target language must be set to C++"?

I am using MATLAB R2021b (the latest version). This error also occured in the previous version.

I replaced the "RL Agent" block with a "MATLAB Function" block containing the policy generated for my controller.

I keep receiving this message even after I changed the taget language from "C" to 'C++".

For deep learning, the simulation target language must be set to C++. Function 'MATLAB Function' (#66.286.341), line 13, column 11: "coder.loadDeepLearningNetwork('agentData.mat','policy')" Launch diagnostic report.

Component:MATLAB Function | Category:Coder error

Persistent variable 'policy' must be assigned before it is used. The only exception is a check using 'isempty(policy)' that can be performed prior to assignment. Function 'MATLAB Function' (#66.398.404), line 16, column 19: "policy" Launch diagnostic report.

Component:MATLAB Function | Category:Coder error

Function call failed. Function 'MATLAB Function' (#66.140.167), line 7, column 11: "localEvaluate(observation1)" Launch diagnostic report.

Component:MATLAB Function | Category:Coder error

Errors occurred during parsing of MATLAB function 'IntegratedSys/MATLAB Function'

Component:MATLAB Function | Category:Coder error

Errors occurred during parsing of MATLAB function 'IntegratedSys/MATLAB Function'

This is the code inside the "MATLAB Function" blcok (which I generated it using the function "generatePolicyFunction"):

function action1 = evaluatePolicy(observation1)
%#codegen

% Reinforcement Learning Toolbox
% Generated on: 26-Sep-2021 07:01:45

action1 = localEvaluate(observation1);
end
%% Local Functions
function action1 = localEvaluate(observation1)
persistent policy
if isempty(policy)
	policy = coder.loadDeepLearningNetwork('agentData.mat','policy');
end
observation1 = observation1(:)';
action1 = predict(policy, observation1);
end

[Walter Roberson]

I note you are using R2021b and that you have LCC-win64 configured. However I notice in https://www.mathworks.com/support/requirements/supported-compilers.html that LCC-win64 is not supported for R2021b.

[Ismaeel]

Thank you Walter.

I am not professional in this filed and this term is new to me. I was wondering if there is a suported version of it or anything else that solves the problem.

I am also wondering why the message is not clear to the user. I followed what the message tells me and changed the setting accordingly, however, nothing changed.

[Walter Roberson]

Supported in R2021b for those purposes:

MinGW 6.3 C/C++ (Distributor: mingw-w64) Available at no charge

Microsoft Visual C++ 2019 product family

Microsoft Visual C++ 2017 product family

Answer 1

[宝]

Is 2022 now,this question still here!

[Walter Roberson]

The original poster was trying to use LCC-win64 2.4.1 as the compiler, but R2021b supports only MinGW 6.3, VS 2019, and VS 2017 for those purposes.

[chaoyang]

May I ask if you have resolved it? I have encountered the same problem