Dynamically Sized Inputs and Outputs

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Daniel
Daniel 2012-9-7
Hello,
I understand that when building an S-Function, whether from an M-File, C-MEX or S-Function Builder, with dynamically sized inputs and outputs Simulink always set the outputs width as the same size of the inputs.
Is there any way of bypassing this restriction?
I would like to create an S-Function in which both inputs and outputs are dynamically sized, although the size of the output must be defined from a fixed-size input.
Thank you.
  2 个评论
Kaustubha Govind
Kaustubha Govind 2012-9-7
Daniel: Do you mean the output is a variable-size signal whose size varies depending on the value of the input?
Daniel
Daniel 2012-9-10
Yes, I would need an S-Function with two inputs (one being a vector and the other a single element). The second input will determine the size of the output and it is not the same size of the vector input.
Thank you

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Guy Rouleau
Guy Rouleau 2012-9-10
Give a look at this post about creating variable size signals and s-function:
http://blogs.mathworks.com/seth/2011/06/28/variable-size-signals-and-unit-delay/
You will see that you have 2 options to determine the dimension of the output. If you type sfundemos in MATLAB, you will see ll example of s-function. Dig through that and you will find examples for both.

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