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Data from simulink to python with "To Workspace" block

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Patrick
Patrick on 23 Jan 2021
Edited: Deepak Meena on 1 Feb 2021
Hi everyone,
I would like to use a controller written in python for a simulink enviornment and therefore I am using the python matlab API. But the problem is how do i get information (state information for each time step) from the simulink enviornment to my python script. I have tried the following in python:
import matlab.engine
import matplotlib.pyplot as plt
eng = matlab.engine.start_matlab()
modelName = 'plant'
eng.eval("model = '{}'".format(modelName), nargout=0)
eng.eval("load_system(model)", nargout=0)
# Initialize Control Action to 0
u = 0
eng.set_param('{}/u'.format(modelName), 'value', str(u), nargout=0)
print("Initialized Model")
# Start Simulation and then Instantly pause
eng.set_param(modelName, 'SimulationCommand', 'start', 'SimulationCommand', 'pause', nargout=0)
print(eng.who())
eng.set_param(modelName, 'SimulationCommand', 'stop', nargout=0)
eng.quit()
The simulink model "plant" is attached where I use "To workspace" block to load the data in to the workspace. But I don't know how to get the data now of the object "eng.workspace['out']"
MATLAB version: R2020b
Python: 3.7.9
Thanks in advance

Accepted Answer

Deepak Meena
Deepak Meena on 31 Jan 2021
Edited: Deepak Meena on 1 Feb 2021
Hi Patrick,
Out is the variable which store the output of the To workspace block. By default the variable would be if type of Timeseries. To change it to array , go to block parameter->save format , change it to Array.
Now out contains many variable , but the variable you are looking for would be out.simout , so to access that in python:
p = eng.workspace['out.simout'];

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