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.

Read more about State Variable: Examples, Control Systems Engineering, See Also

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### Famous quotes containing the words variable and/or state:

“Walked forth to ease my pain

Along the shore of silver streaming Thames,

Whose rutty bank, the which his river hems,

Was painted all with *variable* flowers,”

—Edmund Spenser (1552?–1599)

“The essence of the modern *state* is that the universal be bound up with the complete freedom of its particular members and with private well-being, that thus the interests of family and civil society must concentrate themselves on the *state*.... It is only when both these moments subsist in their strength that the *state* can be regarded as articulated and genuinely organized.”

—Georg Wilhelm Friedrich Hegel (1770–1831)