The extrinsic function 'horzcat' is not available for standalone code generation. It must be eliminated for stand-alone code to be generated. It could not be eliminated becaus

Question

Fatemeh Kalantari 2022-12-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1875542-the-extrinsic-function-horzcat-is-not-available-for-standalone-code-generation-it-must-be-elimina

评论： Ram Kokku 2022-12-15

Thanks Jan for your answer.

My mfile is now converted to MEX but can not generate a C/C++ sourse code using GPU Coder APP, giving the following error.

"The extrinsic function 'horzcat' is not available for standalone code generation. It must be eliminated for stand-alone code to be generated. It could not be eliminated because its outputs appear to influence the calling function. Fix this error by not using 'horzcat' or by ensuring that its outputs are unused."

I looked it up in myfile.cu and commmented out //horzcats but no success.

Any ideas?

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Ram Kokku 2022-12-11

@Fatemeh - horzcat is supported for code generation. here the doc for it https://www.mathworks.com/help//matlab/ref/double.horzcat.html.

Are you using coder.extrensic function anywhere? would you be able to share the problematic code snippet?

Fatemeh Kalantari 2022-12-15

Thanks for your help.

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Answer 1

Hariprasad Ravishankar 2022-12-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1875542-the-extrinsic-function-horzcat-is-not-available-for-standalone-code-generation-it-must-be-elimina#answer_1127227

在 MATLAB Online 中打开

Its very likely that you have a coder.extrinsic function defined on horzcat as follows:

function out = foo(a,b)
coder.extrinsic('horzcat');
out = horzcat(a,b);
end

>> codegen -args {ones(5,4), ones(5,4)} foo -config:dll
The extrinsic function 'horzcat' is not available for standalone code generation. It must be eliminated for stand-alone code to be
generated. It could not be eliminated because its outputs appear to influence the calling function. Fix this error by not using
'horzcat' or by ensuring that its outputs are unused.

For MEX code generation, coder.extrinsic calls back into MATLAB runtime to compute the horzcat function. However, for standalone code generation, we don't have MATLAB to call back into, so we see this error.

As my colleague Ram mentioned, since horzcat is supported for code generation, you can remove the coder.extrinsic pragma.

function out = foo(a,b)
out = horzcat(a,b);
end

>> codegen -args {ones(5,4), ones(5,4)} foo -config:dll
Code generation successful.

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Fatemeh Kalantari 2022-12-15

Yes, It worked apparently the code showing the timing for mex file generated from mfile is:

tic;myfile().mex;toc

from myfile.m we will generate myfile.mex

Still not clarified on how to generate the _gpu extension using GPU Coder app?

Ram Kokku 2022-12-15

Hi Fatemeh,

MATLAB Coder and GPU Coder both generate same extension for MEX files, i.e mexa64 (or something similar based on your platform). if you want to confirm if the MEX was generated for GPU or CPU, take a look at the generated files located in codegen/mex/<your design name>. For GPU Coder, you should find .cu files in this directory.

Take a look at this video Using GPU coder to generate Cuda code from Matlab - YouTube.

for Simulink: Deep Learning in Simulink for NVIDIA GPUs: Generate CUDA Code Using GPU Coder - YouTube

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