Modifying state in S-function
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Hello guys,
I am working with Level- 2 M files S-functions and I have a problem trying to modify the state.
As in a switching controller ( state jumps) I want to assign manually the value of the state after a certain condition.
So I tried to do something like
block.ContStates.Data = mynewthing;
but it looks like this is completely ignored by the simulation. I have know idea of making it work.
I have seen a class called SimState and function a function called SetSimState in the s-function template but I don't know how to use it and I am having trouble finding documentation on it.
Does someone know how to do this?
Thanks!
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Titus Edelhofer
le 13 Juil 2011
Hi Thiago,
you cannot directly set the continues states, they are computed by numerical integration. You can only compute the derivative (see function Derivatives in MATLAB\toolbox\simulink\blocks\msfuntmpl.m). If you would have discrete continuous states, then take a look at the function Update, where you set the discrete state (DWork) to whatever you want ...
Titus
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Titus Edelhofer
le 25 Juil 2011
It depends on what is "continuous" for you: a continuous state is the x in some differential equation like x' = 2*x. This state does not switch (only the differential equation might switch, but this can be done). If you have something like x = g(x, y), where y is the input and x is the x of the timepoint before, you can do this (see my answer above). Simulink can model both in one system ...
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