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{{Short description|Variables Control}}In [[optimal control theory]], a '''control''' is a variable chosen by the controller or [[Agent (economics)|agent]] to manipulate [[state variables]], similar to an actual [[control valve]]. Unlike the state variable, it does not have a predetermined [[equation of motion]].<ref>{{cite book |
A control given as a function of time only is referred to as an ''[[open-loop control]]''. In contrast, a control that gives optimal solution during some remainder period as a function of the state variable at the beginning of the period is called a ''[[closed-loop control]]''.<ref>{{cite book |first1=Daniel |last1=Léonard |first2=Ngo Van |last2=Long |title=Optimal Control Theory and Static Optimization in Economics |___location=New York |publisher=Cambridge University Press |year=1992 |isbn=0-521-33158-7 |page=181 |url=https://books.google.com/books?id=gSHxK5Cq4BgC&pg=PA181 }}</ref>
== See also ==
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{{reflist}}
[[Category:Control loop theory]]
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