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Matlab Engine for Python: Import Error: cannot import name "double" from "mlarray"

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Trying to use Matlab engine for python with pyqtgraph for real-time data display.
The matlab version is R2020b and I am on Windows
I can't post the actual code, but in the python file I am using the engine in, I create an instance of a class and repeatedly call a method that gets data from that class and then I want to plot that data.
I am considering trying this on R2022b if I have no luck with R2020b for this application.
Here is the ful llist of exceptions raised by python, I have removed the first part of the absolute path, but each begins at the root of the python virtual environment directory:
  1. Traceback (most recent call last):
  2. File "lib\site-packages\pyqtgraph\multiprocess\remoteproxy.py", line 224, in handleRequest
  3. opts = pickle.loads(optStr)
  4. File "lib\site-packages\matlab\mlarray.py", line 31, in <module>
  5. from _internal.mlarray_sequence import _MLArrayMetaClass
  6. File "lib\site-packages\matlab\_internal\mlarray_sequence.py", line 3, in <module>
  7. from _internal.mlarray_utils import _get_strides, _get_size, \
  8. File "lib\site-packages\matlab\_internal\mlarray_utils.py", line 8, in <module>
  9. import matlab
  10. File "lib\site-packages\matlab\__init__.py", line 24, in <module>
  11. from mlarray import double, single, uint8, int8, uint16, \
  12. ImportError: cannot import name 'double' from 'mlarray' (lib\site-packages\matlab\mlarray.py)

Answers (1)

Nihal Reddy
Nihal Reddy on 15 Feb 2023
This is likely due to MATLAB Engine not being installed correctly. Please see the below documentation references:
In particular, make sure that you call the installation script with the version of Python you intend to use and that your Python path is updated accordingly.

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