How do I freeze a Simulation in Simulink, close MATLAB

John Williams answered . 2024-12-21 17:18:45

open_system('vdpOperatingPointExample') %open the Simulink model

%make sure the initial state of the model is set to default empty
set_param('vdpOperatingPointExample','InitialState','[]')

%enable the option of saving the last simulation operating point
set_param('vdpOperatingPointExample','SaveFinalState','on','FinalStateName',...
'myOperPoint','SaveOperatingPoint','on');

%run the simulation for 10 seconds
% because the last state at time equal to 10 seconds will be saved
simOut = sim('vdpOperatingPointExample','StopTime','10')

% when a Simulink model completes its simulation
% it will save the output in a structure by default called "simOut".
% Below, the operating point called "myOperPoint" is being extracted
% and saved locally in the MATLAB base workspace 
myOperPoint = simOut.myOperPoint

% Save the operating point that was extracted (the one at time 10)
% inside a MAT-file called "data.mat" to be able to close MATLAB
% and not lose the data
save('data','myOperPoint')

save_system('vdpOperatingPointExample') %save changes to model

Now you can close MATLAB and then execute the below script to extract the saved operating point and then start the simulation from time 10s:

open_system('vdpOperatingPointExample')

%{
The below command is optional. It was added it just to point
out that you probably would want to turn off the option
of saving the final operating point because we don't need
it anymore and we don't want it to interfere with
the original operating point
%}

% disable the option of saving the last operating point
set_param('vdpOperatingPointExample','SaveFinalState','off',...
'SaveOperatingPoint','off'); 

%%%%%%%%%%%%%%%

% The below is mandatory

% load the operating point we saved in the data.mat MAT-file
load data

% set the initial state of the system to be the operating point
% last saved in the last simulation
set_param('vdpOperatingPointExample','LoadInitialState','on','InitialState',...
'myOperPoint');

% execute the simulation for stop time 20 seconds now
% it should start from t = 10s
sim('vdpOperatingPointExample','StopTime','20')

%reset initial state to default empty when sim is over
set_param('vdpOperatingPointExample','InitialState','[]')

 

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