Matlab system and ! commands point to wrong python version?

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I am trying to run python programs using the system function in Matlab. In spite of changing the PythonEnvironment using;
>> pe=pyenv('Version','/opt/anaconda3/bin/python3.8')
pe =
PythonEnvironment with properties:
Version: "3.8"
Executable: "/opt/anaconda3/bin/python3.8"
Library: "/opt/anaconda3/lib/libpython3.8.dylib"
Home: "/opt/anaconda3"
Status: NotLoaded
ExecutionMode: InProcess
When using the ! or system comands, Matlab still utilises the old Python vesion. This is illustrated below...
>> pyenv
ans =
PythonEnvironment with properties:
Version: "3.8"
Executable: "/opt/anaconda3/bin/python3.8"
Library: "/opt/anaconda3/lib/libpython3.8.dylib"
Home: "/opt/anaconda3"
Status: NotLoaded
ExecutionMode: InProcess
>> ! python --version
Python 2.7.16
>> system('python --version')
Python 2.7.16
ans =
0
How can I get these commands to access my python 3.8?

Accepted Answer

Walter Roberson
Walter Roberson on 12 Oct 2021
This is expected. Using ! or system() find the python that is first in your system path, which might not be the same one you have configured MATLAB to use. Using the pyenv() call does not reconfigure your PATH environment variables.
You might need to do something like
!PATH="/opt/anaconda3/bin:$PATH" python -version
I do not know enough about python to know whether you need to configure an environment variable for the library.
  1 Comment
Mark Davidson
Mark Davidson on 13 Oct 2021
Thank you! This worked very well.
>> myPath='/opt/anaconda3/bin:$PATH'
system(['export PATH=' myPath ' ; ','python --version']);
myPath =
'/opt/anaconda3/bin:$PATH'
Python 3.8.8

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