Error in Matlab2017b coder: the extrinsic function "size" is not available for standalone code generation.

m-scripting file is executing without errors. While generating the C-code using "Coder", i am getting the errors for the functions "Size" and "xmlread". Erros is attached for reference.

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[Matan Silver]

Hi Pradeep,

To best investigate some of these errors and help you resolve them, could you provide a short reproduction script that will produce these errors?

I will try to help as much as I can with the information here. Are you explicitly declaring certain functions extrinsic using "coder.extrinsic"? If so, the errors relating to standalone code generation are accurate--standalone code can't use the output of extrinsic functions because that requires calling into MATLAB (and standalone code must work without MATLAB).

Regarding the function "xmlread" which you mentioned--"xmlread" does not support code generation. The development team is aware of this limitation. There are a few workarounds to the lack of support for now:

• You can use "coder.write" and "coder.read" to store and read structured data: https://www.mathworks.com/help/coder/ref/coder.write.html, https://www.mathworks.com/help/coder/ref/coder.read.html.
• You can use "coder.load" if you are ok with the contents of a file being read only once during code generation and stored as a constant in the generated code itself.
• You can use "fscanf" if you can put your data in a text file with a simple-enough format: https://www.mathworks.com/help/matlab/ref/fscanf.html#refsect-extended-capabilities

None of those solutions will read from an xml file, but if you use a different file format for this application, you might be able to use one of those options.

Let me know if you can upload some reproduction examples. Thanks,

Matan

[Pradeep Kumar Boggarapu]

Dear Marthan,

Thank you.

Any supporting documnet which contains the list of unsupported functions for the Matlab coder.

At present, I cannot share the code.

Thank you very much.

With regards,

Pradeep Kumar

Answer 1

[Denis Gurchenkov]

size() is supported for code generation, this is one of the basic functions that always works. To understand why the error happens, one needs to see the source code of the example. This is either a bug or some misconfiguration. Maybe you try to call size on the return value of an extrinsic function? If so, read the chapter on extrinsic functions here

As Matan said, xmlread() does not support code generation. You'd need to use coder.ceval to call to some thrid-party xml reading library.

> Any supporting documnet which contains the list of unsupported functions for the Matlab coder.

Documentation for each MathWorks toolbox function has the "extended capabilities" section at the bottom, and if the function supports code generation, that capability is listed there, along with any limitations. If there is no extended capabilities section, then the function does not support code generation.

[Pradeep Kumar Boggarapu]

Thank you very much Denis Gurchenkov and Marthan for the support.