An Error When Using MATLAB Engine API for Python

Hello all,

I want to run a MATLAB Simulink model in Python. The Python environment is 3.7.9, while the Simulink is 2020a. The Python API was also installed properly. And the model and the code are in the same folder.

import matlab.engine

    #Establish a connection
    print("Starting MATLAB")
    eng = matlab.engine.start_matlab()
    print("Connected to MATLAB")
    
    #Load the model
    env_name = 'case1'
    eng.load_system(env_name)
    
    

Thanks.

Answer 1

[Pratik Pawar]

Please note that Anaconda is not supported, and is not guaranteed to work. The supported Python Implementation can be found through:

https://mathworks.com/help/matlab/matlab_external/install-supported-python-implementation.html

Python Engine simply launches MATLAB, passes requests to MATLAB and retrieves results. Python Engine is a bridge between Python and MATLAB, it doesn't know what's happening in MATLAB. It is up to MATLAB regarding things like MATLAB Path.

As a possible workaround, try following things

• Add the path using python engine

eng.addpath(path_to_Simulink_model)

• If the addpath does not work, create pathdef.m in the working directory and add all the wanted pathes.

If you want to open Simulink model then use the following

eng.open_system(env_name,nargout=0)

If you don't want to open the model, just load the system and run it

eng.load_system(env_name)
results = eng.sim(env_name)
eng.close_system(env_name, nargout=0)