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
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Fatemeh Kalantari
le 10 Déc 2022
Commenté : Ram Kokku
le 15 Déc 2022
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
le 11 Déc 2022
@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?
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Hariprasad Ravishankar
le 13 Déc 2022
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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Ram Kokku
le 15 Déc 2022
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.
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Walter Roberson
le 10 Déc 2022
Déplacé(e) : Image Analyst
le 10 Déc 2022
Does the same problem occur if you use [] notation?
horzcat(a,b)
[a,b]
should be the same. Maybe it only allows [] with constants?
You could also try
cat(2,a,b)
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