How to tell if an object is an Uncertain state-space (USS) model?

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John
John 2023-4-25
评论： John 2023-4-25
I have a function that is overloaded, and takes both standard state space, and uncertain (uss) state space as inputs.
Since c2d() doesn't work for uss, i need to do a different process depending on which type I pass in.
How can I tell programatically if an object is an Uncertain state-space (USS) model, vs a normal state space model?
I tried isempty(), isfield(), etc, but none of these commands are accepted on both uss and normal state space objects.

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Paul
Paul 2023-4-25
Ran in:
Hi @John
Looks like isuncertain can be used to query if the input is uncertain.
Also, there is a function isStateSpace that can handle the other part, though it might be undocumented.
p = ureal('p',1);
usys = tf(p,[1 p]);
usys
Uncertain continuous-time state-space model with 1 outputs, 1 inputs, 1 states. The model uncertainty consists of the following blocks: p: Uncertain real, nominal = 1, variability = [-1,1], 1 occurrences Type "usys.NominalValue" to see the nominal value and "usys.Uncertainty" to interact with the uncertain elements.
isuncertain(usys)
ans = logical
1
isStateSpace(usys)
ans = logical
1
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John
John 2023-4-25
Ah, great. Thanks @Paul, that solves it. I searched the documentation but didn't find this. Still not sure how else to find this type of thing in the future :)

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