Matlab crashes when using a virtual environment as the python interpreter

Hi,

I want to use some python packages / custom code in a deployed matlab application (compiled via mcc). To avoid missing python installs on the target machine, i want to distribute a virtual envrionment with my compiled application such that my application is self-sufficient.

However, when i attempt to set my intepreter to the virtual environment and then call some py.funcname to load it, Matlab crashes completely silently with no error messages.

Note: i run this at Matlab startup. I'm using R2022a. Python = 3.9.7

I create a virtual env with cmd :

python --version
Python 3.9.7
python -m venv c:/users/joee/dev/testenv

The i start matlab and run :

pyenv(Version="C:\users\joee\dev\testenv\Scripts\python", ExecutionMode="OutOfProcess");
pyenv
ans = 
  PythonEnvironment with properties:

          Version: "3.9"
       Executable: "C:\users\joee\dev\testenv\Scripts\python.EXE"
          Library: "C:\Users\Joee\AppData\Local\Programs\Python\Python39\python39.dll"
             Home: "C:\users\joee\dev\testenv"
           Status: NotLoaded
    ExecutionMode: OutOfProcess

result = py.math.sqrt(10); % Matlab crashes silently. Completely dies. No error messages, nothing. 

What am i missing?

Edit : I just found this bug report for 2022a. I'll try the fix here and post the result if it works. https://uk.mathworks.com/support/bugreports/details/2721315

Answer 1

[Joe Elsom]

Okay, for anyone experiencing this issue with R2022a update 3 or below, follow the instructions on this bug report https://uk.mathworks.com/support/bugreports/details/2721315

I found, R2022a Update 5 actually solves this issue completely without needing to adjust the library path.