Run Matlab FUNCTION at the end of Simulink simulation

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Alberto Mora 2020-5-30

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https://ww2.mathworks.cn/matlabcentral/answers/538471-run-matlab-function-at-the-end-of-simulink-simulation

评论： Alberto Mora 2020-6-5

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 2020-5-31

Why not use To block and then use those results in a script file?

Alberto Mora 2020-5-31

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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Answer 1

Sai Sri Pathuri 2020-5-30

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https://ww2.mathworks.cn/matlabcentral/answers/538471-run-matlab-function-at-the-end-of-simulink-simulation#answer_443163

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.

https://in.mathworks.com/help/simulink/ug/model-callbacks.html

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Alberto Mora 2020-5-31

编辑：Alberto Mora 2020-5-31

在 MATLAB Online 中打开

Hello Sai, thanks for your replay.

I try your suggestion but it does not work. Below you can find an image of the simulink model.

In particular I put my custom plot function in a block "MATLAB function", with the required inputs for the plot (constant and signals).

There are also two "special" inputs: ifPlot is a scalar that I set manually 0 or 1 to decide if I want to plot the results, "FlagEndSim" is a value used for evaluate the end of the simulation (also in this case 0 or 1).

Then I created a callbacks "InitFnc" with a constant FlagEndSim=0 in order to don't execute the "MATALB function" at the beginning of the simulation. Then I also created a "StopFnc" callbacks with a constant FlagEndSim=1 that is set at the end of the simulation.

Inside my "MATLAB function" there is a if condition where I check simply that both conditions are 1:

if ifPlot && FlagEndSim
    % my plot function
end

However the matlab function is not executed at the end of the code, even if the FlagEndSim became 1 at the end of the code.

How can I solve it?

Sai Sri Pathuri 2020-6-2

在 MATLAB Online 中打开

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 2020-6-5

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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