Python Error: EngineError: Unable to connect to MATLAB session

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tane martin 2020-9-18

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https://ww2.mathworks.cn/matlabcentral/answers/595768-python-error-engineerror-unable-to-connect-to-matlab-session

编辑： Ahmed Abida 2021-2-25

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Hey all,

I'm experiencing the following error when trying to share the Matlab engine with Python:

Error using matlabfuture>result (line 87)
Python Error: EngineError: Unable to connect to MATLAB session 'Matlab_Engine_Test'.
Error in futureresult>result (line 67)
Error in __init__>connect_matlab (line 177)
Error in client>testing_output (line 204)

The code works by running a Matlab script that creates a Python Object. Then it calls the class method test_method():

if ~matlab.engine.isEngineShared
    matlab.engine.shareEngine('Matlab_Engine_Test')
end
a = py.py_lib.py_class;
a.test_method()

The method test_method() attempts to connect to the Matlab engine and then create a variable in the workspace:

def testing_output(self):
        eng = matlab.engine.connect_matlab('Matlab_Engine_Test')
        eng.workspace['temp'] = 1223
        return names

But the connection fails and produces the previously mentioned error.

Based on the documentation it looks to me like this should work. Anyone have any ideas?

EDIT: I should clarify why I'm building it this way instead of just having the Python method return a value as you'd expect.

I'm testing how to connect Python to the "active" workspace. In practice the method that will actually run is a callback function triggered by an API returning data that'll need to retuirn values to the workspace. The best way I can think is to add a variable to the workspace through the shared engine accessed through Python. (If anyone has better suggestions, I'm all ears).

So to test this out I just figured I'd do it without the callback and possible issues that could create and just use a test method I could call directly.

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Ahmed Abida 2021-2-24

编辑：Ahmed Abida 2021-2-25

Hi, i have the same problem, I understand that there is a conflict when you lunch the python modul from the same Matlab session.. I have the same problem but there is no documentation

Ahmed Abida 2021-2-25