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. ==Examples== ...
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http://en.wikipedia.org/wiki/State_variable
element of a vector x(t) in a system with the differential equations state equation output equation, and for linear systems = A •x(t)+ B •u(t) state equation v(t) = C •x(t) + D•u(t) output equation, from which at known initial conditions at any instant t
0 (often with t
0 = 0) and known course of ...
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=351-21-08
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