Can somebody give an brief idea where s function's can be used and what is it all about?
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el 22 de Dic. de 2016
Comentada: Walter Roberson
el 24 de Dic. de 2016
Can somebody give an brief idea where s function's can be used and what is all about?
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Walter Roberson
el 22 de Dic. de 2016
"An S-function is a computer language description of a Simulink block written in MATLAB®, C, C++, or Fortran. C, C++, and Fortran S-functions are compiled as MEX files using the mex utility (see Build MEX File). As with other MEX files, S-functions are dynamically linked subroutines that the MATLAB execution engine can automatically load and execute."
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Image Analyst
el 24 de Dic. de 2016
Editada: Image Analyst
el 24 de Dic. de 2016
I guess your original guess was right Walter. I've added Simulink to the product list above.
Walter Roberson
el 24 de Dic. de 2016
" Do they (S functions) have anything to do with the Laplace transforms or State space equations"
They could, but they can be most anything. They are a way to call code in Simulink instead of having to implement the code entirely as Simulink blocks.
Más respuestas (2)
Image Analyst
el 22 de Dic. de 2016
s functions, or "sigmoid" curves are often used in logistic regression. The help on glmfit() has an extensive discussion on them. Attached is the demo from the help.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/176184/image.png)
They are used other places too, like when you're talking about the lifetime of innovations/inventions ( https://en.wikipedia.org/wiki/Diffusion_of_innovations ).
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/176185/image.png)
If you want more help, you'll probably have to describe the context of where you think you might be using s functions.
2 comentarios
Walter Roberson
el 22 de Dic. de 2016
Ah, I see now the product Statistics and Machine Learning is attached, so this makes sense.
Image Analyst
el 22 de Dic. de 2016
I don't have Simulink, so who knows? It could well be both stats and Simulink, couldn't it? Or one or the other. If the original poster ever comes back, maybe it will be clarified.
KSSV
el 22 de Dic. de 2016
A function is part of code, which you call very often...and you want to avoid coding it every time. A function takes required input's and gives the desired output. In most of the coding software's you find functions. For more details, read the link:
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