Run Matlab FUNCTION at the end of Simulink simulation

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Alberto Mora
Alberto Mora 2020 年 5 月 30 日
コメント済み: Alberto Mora 2020 年 6 月 5 日
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
  2 件のコメント
madhan ravi
madhan ravi 2020 年 5 月 31 日
Why not use To block and then use those results in a script file?
Alberto Mora
Alberto Mora 2020 年 5 月 31 日
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 2020 年 5 月 30 日
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.
  7 件のコメント
Sai Sri Pathuri
Sai Sri Pathuri 2020 年 6 月 2 日
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 2020 年 6 月 5 日
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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