What is a "system variable" in a Simulink model?

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Hi, I am reading documentation regarding how to use solvers for Simscape, and I ran across the term "system variable" in the following page:
Any ideas on what specifically is a "system variable?"
My inclination is to think it's likely the time of a simulation, or rather the input to the system (and how that relates to time). I don't know if that's correct though.
Thank you,

Accepted Answer

Jim Riggs
Jim Riggs on 11 Feb 2020
Edited: Jim Riggs on 11 Feb 2020
In this context, the "system" is the device that you are modelling. Therefore, a "system variable" is one of the variables in your model. It appears that, in the referenced link, the "system" is specifically a reference to the equations of state, so "system variables" are the state variables in the model equations.

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