How to execute a simulink simulation stepwise from python without a display?

Question

kha 2022-6-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1731545-how-to-execute-a-simulink-simulation-stepwise-from-python-without-a-display

回答： Anjaneyulu Bairi 2023-9-6

I have a .slx file with a simulink simulation that i run from python code. I need to execute it step-wise and adjust parameters after each step.

My code is executed on a server to which i have remote access via SSH. The goal is to execute multiple variants of the simulation in parallel and disconnect from the server while the simulations are executed.

The 'set_param' command can not be used for this due to having no display. According to https://de.mathworks.com/help/simulink/slref/set_param.html the 'sim' command should be used in this case. While

sim_out = eng.sim('simulation_name')

works fine and returns the desired values it dows not work with

sim_out = eng.sim('simulation_name','StartTime','0.0','StopTime','10.0')

which would be needed for a stepwise execution. Or rather: I can execute it, but the return value is an empty array of shape (1,1,0).

I noticed that the second command works perfectly fine when put into the matlab command prompt instead of executing it via python.

My aim is to have something as following:

import matlab.engine as me
eng = me.start_matlab('-nodesktop -nosplash -nodisplay')
step_size = 10.0
steps = 1500
for i in steps:
    action = get_action(state)
    sim_out = sim('simulation_name','Action',str(action),'StartTime',str(i * step_size),'StopTime',str((i+1) * step_size))
    state = np.array(eng.workspace['State'])
end