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:
“The fate of the poor shepherd, who, blinded and lost in the snow-storm, perishes in a drift within a few feet of his cottage door, is an emblem of the state of man. On the brink of the waters of life and truth, we are miserably dying.”
—Ralph Waldo Emerson (1803–1882)
“Walked forth to ease my pain
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Was painted all with variable flowers,”
—Edmund Spenser (1552?–1599)