MATLAB: Question about S function

level-2 s-functionsimulink

Hi,

Is it possible to realize the following with Level 2 S function?

The input is a binary data, that is, every time only one bit can be read. The output shall save up to 10 bit and give them out. In this case the sample times at the input and at the output are different.

The problem is, in S function "block.InputPort(1).Data" is only valid for the current sample time.

Thanks Senmeis

Best Answer

You need to create DWork vectors for the S-function to store all previous inputs.

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MATLAB: SImple question about Simulink S function

You can use block.CurrentTime to get the current time in the S-function. You can use a DWork to store the current time at each step and use it in the next step to compute the difference.

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Oops, just realized that you are asking about the InitializeConditions function, and not Update or Outputs. The initial condition of your state depends on the dynamics of your system or application - it's hard for us to tell what it should be. The only thing that I can say is that it needs to be of size 3000. For example, for zero-initial condition, you can say:

   block.Dwork(3).Data = zeros(3, N);

Best Answer

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MATLAB: SImple question about Simulink S function

MATLAB: Matlab coding to s-function level 2 coding.

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