Getting/Setting Sampling Time of S-Function (Level 2)

SeungHwan Jo

2017 3 9

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I'm having trouble with getting sampling time of S-Function(Level 2). Documentation says there's some way to set-up sampling time but, it's mostly about it's type(discrete, inherited, continuous...). Especially, Continous(inf), But I need sampling time in my simulation and even it says continuous, It must have sampling time since it's computer. So question is how to get/set sampling time of continuous sampling S-function.

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Michelle Wu 2017-3-13

Your best reference for understanding the S-Function sample time would still be the following two docs:

https://www.mathworks.com/help/simulink/sfg/s-function-concepts.html#f6-24743

https://www.mathworks.com/help/simulink/sfg/sample-times.html

which I think you probably have came across already.

Unfortunately for a system to be continuous, its sample time has to be 0. It is not a limitation posed by Simulink or S-Function, but one posed by the theory behind the concept of sampling: for a continuous system, the frequency has to be infinite and the sample time is thus 0.

If you would like to have a small sample time (like a high frequency CPU), then the proper choice is probably "discrete" with a very small sample rate.

SeungHwan Jo 2017-4-3

编辑：SeungHwan Jo 2017-4-3

Thank you for the answer. Yes, I know about the continuous concept, but I don't think MATLAB/Simulink works that way cause it imposes very high load to CPU and does not coincide with Simulink itself's sampling time concept.

I was doing simple collision processing in Level 2 S-Function. And I just could be able to find out that sampling time of continuous function coincide with 3~5 times of Simulink timestep. But, I want something solid.

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