How to interrupt Simulink when running through Python? (Requirements: Monitoring? Waiting for the interrupt signal from users)

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鹏涛 谢
鹏涛 谢 2023-6-11
回答： Ayush 2023-8-15
Hello! I'm new to Matlab and now working to control simulink through python.
  • Goal: I want to interrupt the running of Simulink with the help of the keyboard, but it should be done in a GUI on python. When the simulink model pauses, I can update the parameters of some blocks(or switch the mode of the model).
  • Problem: The interruption point of running of the Simuink can only be set before I run the simulink model. E.g. I can set the model to pause at 2s. But I can not interrupt it at any time. Although we can click "pause" on Simluink GUI but I have to only control the simulink model thorugh a GUI built in Python.
  • Code: Here I used "set_param" to realize "stop","start","update parameters". But I can not interrupt the model whenenver I want(without setting interruption points bevorhand). The code can not caputure the keyboard event, when I pressed ‘space’ on thekeyboard.
This is the code of Python(3.8).
import matlab
import matlab.engine
import numpy as np
import matplotlib.pyplot as plt
import keyboard #monitor the event from keyboard
def Change2VM():
eng = matlab.engine.start_matlab()
env_name = 'simpleSinEnvV3' # define the name of Simulink model
# eng.load_system(env_name) # load
eng.set_param(env_name, 'SimulationCommand','Pause') # interrupt the model
eng.set_param('simpleSinEnvV3/Modus','value', '1', nargout=0) #change the mode to VM
eng.set_param(env_name, 'SimulationCommand', 'continue', nargout=0); #cancel pause and continue the simulation
print('VM Modus is on\n')
def main():
# load the simulink model
eng = matlab.engine.start_matlab()
env_name = 'simpleSinEnvV3'
eng.load_system(env_name)
duration = 5 # in seconds. How long dose this simulation run.
eng.set_param(env_name, 'StopTime', str(duration), nargout=0) # when to stop
eng.set_param('simpleSinEnvV3/Modus','value', '2', nargout=0) # set the modus to "EM" at the beginning
eng.set_param(env_name, 'SimulationCommand', 'start', nargout=0) # run the model
print('Wait for key')
keyboard.add_hotkey('space', Change2VM, suppress=False, timeout=1, trigger_on_release=False) # triger the intrruption
eng.set_param(env_name, 'SimulationCommand', 'stop', nargout=0) # stop running the model
t = np.array(eng.eval('out.t.Data'))
y = np.array(eng.eval('out.y.Data'))
eng.quit()
# show the results
fig = plt.figure(figsize=(5, 5))
plt.plot(t, y[:, 0], '-', label='VM')
plt.plot(t, y[:, 1], '-.', label='EM')
plt.plot(t, y[:, 2], '--', label='HB')
plt.legend()
plt.show()
main()
This is my simulink model(Matlab2016a), i want to shift the output from EM(case2) to VM(case1), when I pressed "Space" on keyboard.

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回答（1 个）

Ayush
Ayush 2023-8-15
I understand that you want to pause the simulation in between, perform some action, and resume the simulation later. You can utilize the Python’s capability of detecting a key press to pause/resume the simulation. Here is the skeleton code for that:
# to pause the simulation
while True:
if keyboard.is_pressed("your_key"):
eng.set_param('modename','SimulationCommand','pause')
break
# to resume the simulation
while True:
if keyboard.is_pressed("your_key"):
eng.set_param('modename','SimulationCommand', 'continue')
break
You may refer to Run Simulations Programmatically - MATLAB & Simulink - MathWorks India for further information on how to pause and continue the simulation.

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