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Installing matlab.engine API for Python in linux-based HPC

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Jianing
Jianing 2023-1-22
编辑： Ashu 2023-1-27
I want to use the HPC to accelerate my python-controlled Simulink.
Therefore, I have to install the matlab.engine on the HPC first.
Since my university's HPC only provides the Matlab-R2020a, so I have to use Python 2.7/ 3.6/ 3.7.
So I did the following steps. First I used Python 2.7
  1. cd /home/ViperAppsFiles/matlab/2020a/extern/engines/python/
  2. python setup.py build --build-base = /home/users/.cache install --prefix=/home/users/software
Now the whole module is built in software folder. Then I change the PYTHONPATH by:
export PYTHONPATH = /home/user/software/lib/python2.7/site-packages:$PYTHONPATH
But it reports the fault when I tried to call import matlab.engine:
Please contact MathWorks Technical Support for assistance:
Details: need more than 3 values to unpack
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/user/software/lib/python2.7/site-packages/matlab/__init__.py", line 209, in <module>
raise RuntimeError('unable to read {}'.format(get_arch_filename()))
RuntimeError: unable to read /home/user/software/lib/python2.7/site-packages/matlab/engine/_arch.txt
>>> RuntimeError: unable to read /home/user/software/lib/python2.7/site-packages/matlab/engine/_arch.txt
File "<stdin>", line 1
RuntimeError: unable to read /home/user/software/lib/python2.7/site-packages/matlab/engine/_arch.txt
^
SyntaxError: invalid syntax
And according to this method, the module only support 2.7, 3.8, 3.9, which 3.8 and 3.9 is incapable of cooperating with matlab/R2020a.

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回答（1 个）

Ashu
Ashu 2023-1-27
Hi Jianing,
To install Python Engine you have to follow these steps -
1. Find the matlabroot by executing the following command at the MATLAB command window
matlabroot
2. change directory to :
<matlabroot>\extern\engines\python
3. Execute the follwing command with admin privilege :
python setup.py install
I would suggest you to use plain command like mentioned above, but if needed try the following for your use case:
python setup.py build -b <somedir> install
Then export the path if needed.
For more information on matlab.engine for python you can refer
https://www.mathworks.com/help/matlab/matlab_external/get-started-with-matlab-engine-for-python.html
Regards
Ashutosh
  2 个评论
Jianing
Jianing 2023-1-27
Thanks for you time. Now the Matlab.engine has installed on the HPC server and could be called.
However, only these two commands could work.
>>> import matlab.engine
>>> env = matlab.engine.start_matlab()
When I started to call the real simulink file as follows:
>>> env_name = 'TEST_2020'
>>> env.load_system(env_name)
Then the error is as:
Caught "std::exception" Exception message is:
libasound.so.2: cannot open shared object file: No such file or directory: Success: Success
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/722179/.conda/envs/matlab_python_37/lib/python3.7/site-packages/matlab/engine/matlabengine.py", line 71, in __call__
_stderr, feval=True).result()
File "/home/722179/.conda/envs/matlab_python_37/lib/python3.7/site-packages/matlab/engine/futureresult.py", line 67, in result
return self.__future.result(timeout)
File "/home/722179/.conda/envs/matlab_python_37/lib/python3.7/site-packages/matlab/engine/fevalfuture.py", line 82, in result
self._result = pythonengine.getFEvalResult(self._future,self._nargout, None, out=self._out, err=self._err)
matlab.engine.MatlabExecutionError: libasound.so.2: cannot open shared object file: No such file or directory: Success: Success
Could you please tell me where went wrong?
Ashu
Ashu 2023-1-27
编辑：Ashu 2023-1-27
It says no file or directory found. Can you confirm if the env exists at the current directory?

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