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Movie Title Year Distributor Notes Rev Formats Career Bed 1969 Something Weird Video NonSex A finite-state machine (FSM) or finite-state automaton (FSA, plural: automata), finite automaton, or simply a state machine, is a mathematical model of computation. It is an abstract machine that can be in exactly one of a finite number of states at any given time. The FSM can change from one state to another in response to some inputs; the change from one state to another is called a transition.[1] An FSM is defined by a list of its states, its initial state, and the inputs that trigger each transition. Finite-state machines are of two types—deterministic finite-state machines and non-deterministic finite-state machines.[2] A deterministic finite-state machine can be constructed equivalent to any non-deterministic one. The behavior of state machines can be observed in many devices in modern society that perform a predetermined sequence of actions depending on a sequence of events with which they are presented. Simple examples are vending machines, which dispense products when the proper combination of coins is deposited, elevators, whose sequence of stops is determined by the floors requested by riders, traffic lights, which change sequence when cars are waiting, and combination locks, which require the input of a sequence of numbers in the proper order. The finite-state machine has less computational power than some other models of computation such as the Turing machine.[3] The computational power distinction means there are computational tasks that a Turing machine can do but an FSM cannot. This is because an FSM's memory is limited by the number of states it has. FSMs are studied in the more general field of automata theory. Contents 1 Example: coin-operated turnstile 2 Concepts and terminology 3 Representations 3.1 State/Event table 3.2 UML state machines 3.3 SDL state machines 3.4 Other state diagrams 4 Usage 5 Classification 5.1 Acceptors 5.2 Classifiers 5.3 Transducers 5.4 Sequencers 5.5 Determinism 6 Alternative semantics 7 Mathematical model 8 Optimization 9 Implementation 9.1 Hardware applications 9.2 Software applications 9.3 Finite-state machines and compilers 10 See also 11 References 12 Further reading 12.1 General 12.2 Finite-state machines (automata theory) in theoretical computer science 12.3 Abstract state machines in theoretical computer science 12.4 Machine learning using finite-state algorithms 12.5 Hardware engineering: state minimization and synthesis of sequential circuits 12.6 Finite Markov chain processes 13 External links
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