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Run Matlab FUNCTION at the end of Simulink simulation

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Hello,
in a simulink simulation I compute some signals.
At the end of the simulation, when the system reach the steady-state condition, I want to use the final value of such signals to create a custom 3D plot. To do that I already built a Matlab FUNCTION block.
I don't want to run such Matlab FUNCTION block during the simulation because the computational time grows so much, and moreover I am interested only in the final value (steady-state).
How can I run such "Matlab FUNCTION block" only at the end of the simulation?
Thanks and best regards

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madhan ravi
madhan ravi 31 May 2020
Why not use To block and then use those results in a script file?
Alberto Mora
Alberto Mora 31 May 2020
Hello Madhan,
my idea was to create a custom simulink block (with all the instructions for the plot) and add it to my library.
Therefore I want to have all the instructions inside the custom simulink block. I don't want to have a piece of code in a separate script file.
Do you have suggestion to do that?

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Sai Sri Pathuri
Sai Sri Pathuri 30 May 2020
You may use StopFcn callback in your model. Refer the following link for Model callbacks. Expand Model Simulation Callback Parameters in the below documentation for StopFcn.

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Alberto Mora
Alberto Mora 1 Jun 2020
This is a good suggestion, but the problem is that if I continue to "overwrite" (i.e. update) the plot at each time step of the simulink simulation, the computational time of the simulink simulation grow so much, because the plot is updated many thousand of times!
This is why I prefer to avoid to plot during the simulation and I prefer to plot only the last step (at the end of the simulation).
Sai Sri Pathuri
Sai Sri Pathuri 2 Jun 2020
Okay, In order to avoid overwriting and plot only last time step data, you may try this.
In constant block you used for FlagEndSim, use constant value as
[zeros(lengthOfOutput-1);1]
and Sample time as below. This is to retain previous sample rate after conversion by buffer
stepSize*lengthOfOutput
After the constant block, use buffer with output buffer size of 1.
With these changes, you can plot the results of only last simulation.
This is an example I tried at my end. I used a StopTime of 10 and a variable solver. For this, the output is of length 51 and step size is 0.2 (obtained from tout)
So, I have used the following settings
% Constant value
[zeros(50);1]
% SampleTime
0.2*51
Alberto Mora
Alberto Mora 5 Jun 2020
At the end I decided to follow partially your suggestion, comparing the time of the simulation (using clock) and a time defined by the user that set like few ms before the end of the simulation.
It is a pity that does not exist a in matlab way to call a matlab function exacly at the end of the simulation... But it's ok, I solve the problem so does not matter.
Thank for the help and best regards.
Alberto

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