Codegen respond with an error: "??Expected a character vector. "

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Haonan Ding 2021-5-8

2
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https://ww2.mathworks.cn/matlabcentral/answers/825135-codegen-respond-with-an-error-expected-a-character-vector

回答： Paras Gupta 2024-6-21

When I use my training results of DDPG model to generate GPU code, there always respond an error. I followed the instruction "Deploy Trained Reinforcement Learning Policies" from help document, and it runs well in other exmples. Here is error report:

And return code:

>>codegen('-config','cfg','evaluatePolicy','-args',argstr,'-report');
??? Expected a character vector.
Code generation failed: View Error Report
Incorrect use of codegen

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XingZhou Mu 2024-4-14

Hello, did you solve this problem, I am also having the same problem

Jie Li 2024-5-9

竟然是中文路径的问题！改成英文路径就OK了

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回答（1 个）

Paras Gupta 2024-6-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/825135-codegen-respond-with-an-error-expected-a-character-vector#answer_1475311

Hello Haonan,

I understand that you're encountering the error "??? Expected a character vector."

This issue could arise if the name of the specified MAT-file or the absolute file path to the MAT-file contains non-ASCII characters, which are not supported by codegen. Please refer to the 'Limitations' section of the following documentation.

https://www.mathworks.com/help/gpucoder/ref/coder.loaddeeplearningnetwork.html

You can also refer to the below documentation for more information on character encoding in code generation:

https://www.mathworks.com/help/coder/ug/code-generation-for-characters.html

Hope this resolves the query.