Is it possible to compile MATLAB programs that contain Python code using MATLAB Compiler?

I tried compiling my MATLAB program with Python code into a standalone application, but got the following error message when running it:

Undefined variable "py" or function "py.command"

Answer 1

[MathWorks Support Team]

Yes, this workflow is supported. 

But please pay attention to what mentioned in the link below before compiling your code:

https://www.mathworks.com/help/matlab/matlab_external/undefined-variable-py-or-function-py-command.html

A possible cause for this error is that the Python module is on the Python search path.

[Matthew Parrilla]

Glad to hear this workflow is supported, can you explain how to do it?

My installed executable doesn't contain my python code, so the script cannot find the Python module I'm calling from my compiled Matlab script.

When I manually add the python file to the "application" directory my executable has been installed to, it works just fine.

My mcc commands include `-a C:\path\to\file.py` but I had to select that file manually as the deploytool did not find it.

Just to clarify I:

• have python installed
• have the 64bit version of python
• matlab CAN find python (I can print py.sys.path, for example)
• there isn't an error in the module (I can run it from regular Matlab just fine)
• there are no module name conflicts

It sure does seem to me like a bug w/ Matlab, but I'd love to be shown otherwise!

[Matthew Parrilla]

Adding the file to "Files installed for your end user" did the trick.

Answer 2

[Sarah Crimi]

I had this problem as well. I had to manually add the Python files to the folder of the executible.

[Abdelrahman Helaly]

does matlab by default package the required python libraries?

or it just runs the python code on the machine using the default python interpreter on that machine

Answer 3

[Giancarlo Meccariello]

Could you please specify how to add the file to the code?

I am using such a py. function in my standalone app..

rho=py.CoolProp.CoolProp.PropsSI('D','T',273.15+ T_gc_out ,'P',p_h,KM)

however, I don't know how to add this in my standalone programm such that the end user does not require MATLAB and can run the standalone programm without having any troubles.

Answer 4

[Richard Barrett-Jolley]

My experience, just end user, is that compilation of standalone MATLAB apps with python calls to specific files/modules only works if (a) those python modules/scripts are set up to run standalone themselves and the python scripts are either in the root folder of the app, or presumably accessible in the PATH.

So essentially, if I prepare a fully functional app on my PC/Mac which includes calls to custom python scripts, it really wont run on someone else's computer unless they first do all the same Python installation I did and then sort out locating the python scripts themselves.

hopefully a future release could address this. My tests were with MATLAB 2021b.