A state variable is one of the set of variables that are used to describe the mathematical "state" of a dynamical system. Intuitively, the state of a system describes enough about the system to determine its future behaviour. Models that consist of coupled first-order differential equations are said to be in state-variable form.
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Famous quotes containing the words state and/or variable:
“They that have grown old in a single state are generally found to be morose, fretful and captious; tenacious of their own practices and maxims; soon offended by contradiction or negligence; and impatient of any association but with those that will watch their nod, and submit themselves to unlimited authority.”
—Samuel Johnson (1709–1784)
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—Edmund Spenser (1552?–1599)