python library in simulink matlab system block

David Håkansson

2021 8 23

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Hi, I am trying to create a matlab system block in simulink that imports and uses a python library.

After setting up the python environment, I tried the following in the resetImpl method in the matlab system block:

obj.cst = py.importlib.import_module('a valid python library reference')

But that gives me an error:

Function 'py.importlib.import_module' is not supported for code generation. Consider adding coder.extrinsic('py.importlib.import_module') at the top of the function to bypass code generation.'

So I tried to add coder.extrinsic according to the proposal in the error message:

coder.extrinsic('py.importlib.import_module');
obj.cst = py.importlib.import_module('a valid python library reference')

which results in the error:

'Cannot pass a mxArray to 'SystemProp_matlabCodegenValidateAnyProp'.'

Any suggestions?

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David Håkansson 2021-8-24

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In many examples for coder.extrinsic, for example here the parameter needs to be pre-defined before running the extrinsic function. In that example it is on these lines: