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Quantity used to describe the mathematical state of a dynamical system
A state variable is one of the set of mathematical variables that are used to describe the "state" of a system, e.g. of a dynamical system or a thermodynamical
State_variable
Type of variable active electronic filter
A state variable filter (SVF) is a type of active filter in electronic circuits. In a state-variable filter architecture the signal and its successive
State_variable_filter
Mathematical model of a system in control engineering
system identification, a state-space representation is a mathematical model of a physical system that uses state variables to track how inputs shape
State-space_representation
Topics referred to by the same term
Look up Variable, variable, or variables in Wiktionary, the free dictionary. Wikiversity has learning resources about Variable Variable may refer to:
Variable
Quantifiable conditions of a thermodynamic system at a specific time
known as state variables, state parameters or thermodynamic variables. Once such a set of values of thermodynamic variables has been specified for a system
Thermodynamic_state
State machines and generalizations in UML
UML state machines the whole state of the state machine is commonly split into (a) an enumerable state variable and (b) all the other variables which
UML_state_machine
Experimental element which is not changed throughout the experiment
multiple variables, is a control variable. A control variable is an element that is not changed throughout an experiment because its unchanging state allows
Control_variable
Necessary condition for optimality associated with dynamic programming
their state variables, but there would probably be others. The variables chosen at any given point in time are often called the control variables. For
Bellman_equation
Function describing equilibrium states of a system
equilibrium, a state function, function of state, or point function for a thermodynamic system is a function relating several state variables or state quantities
State_function
Principle to predict effects of a change in conditions on a chemical equilibrium
state variable X {\displaystyle X} , with its conjugate state variable Y . {\displaystyle Y.} For this to be of interest, the 'moderating' variable X
Le_Chatelier's_principle
Law of thermodynamics establishing the conservation of energy
the existence of an important state variable that corresponds with adiabatic work, but not that such a state variable represented a conserved quantity
First_law_of_thermodynamics
Body of matter in a state of internal equilibrium
given time is described by its state, which can be specified by the values of a set of thermodynamic state variables. A thermodynamic system is in thermodynamic
Thermodynamic_system
Type of simulation
system state is changed continuously over time on the basis of a set of differential equations defining the rates of change for state variables. In the
Discrete-event_simulation
on continuum mechanics. Most of the work on damage mechanics uses state variables to represent the effects of damage on the stiffness and remaining life
Damage_mechanics
Type of energy transfer
thermodynamic work is defined through changes in the system’s macroscopic state variables, in conjugate pairs such as pressure and volume, or magnetisation and
Heat
Property of a thermodynamic system
Entropy is a thermodynamic state variable that quantifies the probabilistic distribution of accessible microstates in a system. The term and the concept
Entropy
State in which variables of a system are unchanging in time
systems theory, a system or a process is in a steady state if the variables (called state variables) which define the behavior of the system or the process
Steady_state
Predictive filter
adequately approximated by a model having two internal state variables, where the first variable is obtained by integrating the value of the second over
Alpha_beta_filter
Reciprocating internal combustion engine
conventional cast-iron linings ever since. The engine originally used a two-state Variable Valve Timing system to switch the intake cam timing by 30°. Newer variants
Jaguar_AJ-V8_engine
Situation in which state variables of a chemical system are constant with time
In chemistry, a steady state is a situation in which all state variables are constant in spite of ongoing processes that strive to change them. For an
Steady_state_(chemistry)
Date and time representation system widely used in computing
attention to the leap second state variable, which unambiguously indicates whether the leap has been performed yet. The state variable change is synchronous
Unix_time
Computer programming, a variable accessible throughout a computer program
all global variables is known as the global environment or global state. In compiled languages, global variables are generally static variables, whose extent
Global_variable
Physical quantity of hot and cold
described by stating its internal energy U, an extensive variable, as a function of its entropy S, also an extensive variable, and other state variables V, N
Temperature
Properties independent of system size, and proportional to system size
but not both, of a conjugate pair may be set up as an independent state variable of a thermodynamic system. Conjugate setups are associated by Legendre
Intensive and extensive properties
Intensive_and_extensive_properties
Passage of a system from an initial to a final state of thermodynamic equilibrium
thermodynamic state variables, that depend only on the current state of the system, not on the path taken by the processes that produce the state. In general
Thermodynamic_process
Capacitor whose capacitance can be changed
A variable capacitor is a capacitor whose capacitance may be intentionally and repeatedly changed mechanically or electronically. Variable capacitors are
Variable_capacitor
Star whose brightness fluctuates, as seen from Earth
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) changes systematically with time. This variation may be caused by
Variable_star
Function used in optimal control theory
x_{2}(t),\ldots ,x_{n}(t)\right]^{\mathsf {T}}} denotes a vector of state variables, and u ( t ) = [ u 1 ( t ) , u 2 ( t ) , … , u r ( t ) ] T {\displaystyle
Hamiltonian_(control_theory)
Computer programming, a variable only usable in a portion of a program (the scope)
In computer science, a local variable is a variable that is given local scope. A local variable reference in the function or block in which it is declared
Local_variable
Type of energy transfer
matched by values of or contributions to changes in macroscopic internal state variables of the system, which always occur in conjugate pairs, for example pressure
Work_(thermodynamics)
Named container for a particular type of data
In some high-level programming languages, a variable is an abstract storage or indirection location paired with an associated symbolic name, which contains
Variable (high-level programming language)
Variable_(high-level_programming_language)
Numerical method
physically interesting quantity. An adjoint state equation is introduced, including a new unknown variable. The adjoint method formulates the gradient
Adjoint_state_method
boolean matrix with rows corresponding to state codes and columns corresponding to state variables. One state variable is considered at a time, and the algorithm
State_encoding_for_low_power
Dynamic system property
output trajectories The state of a deterministic system, which is the set of values of all the system's state variables (those variables characterized by dynamic
Controllability
State of matter
to as compressibility. Like pressure and temperature, density is a state variable of a gas and the change in density during any process is governed by
Gas
Optimal control equation
the state variables. The costate variables λ ( t ) {\displaystyle \lambda (t)} can be interpreted as Lagrange multipliers associated with the state equations
Costate_equation
Remembered information in a computer system
state is usually represented with temporal logic as explicit variables that represent the program state at each step of a program execution: a state variable
State_(computer_science)
Mathematical way of attaining a desired output from a dynamic system
function of state and control variables. An optimal control is a set of differential equations describing the paths of the control variables that minimize
Optimal_control
Branch of thermodynamics
of macroscopic quantities (non-equilibrium state variables) that represent an extrapolation of the variables used to specify the system in thermodynamic
Non-equilibrium thermodynamics
Non-equilibrium_thermodynamics
Symbol representing a mathematical object
that the variable represents or denotes the object, and that any valid candidate for the object is the value of the variable. The values a variable can take
Variable_(mathematics)
Type of mathematical equation
is a mathematical equation for an unknown function of one or several variables that relates the values of the function itself and its derivatives of
Matrix_differential_equation
Probabilistic optimal control
evolution and observation of the state variables. Stochastic control aims to design the time path of the controlled variables that performs the desired control
Stochastic_control
Set of networking protocols
devices and services with vendor-defined actions, state variables, data structure elements, and variable values. UPnP uses common Internet technologies.
Universal_Plug_and_Play
Algorithm that estimates unknowns from a series of measurements over time
hidden Markov model such that the state space of the latent variables is continuous and all latent and observed variables have Gaussian distributions. Kalman
Kalman_filter
asset pricing model (CAPM). It is a linear factor model with wealth as state variable that forecasts changes in the distribution of future returns or income
Intertemporal_CAPM
Proportion of salt dissolved in water
waters and of biological processes within it, and is a thermodynamic state variable that, along with temperature and pressure, governs physical characteristics
Salinity
Electronic filter circuits defined by component connection
2019-10-28. Retrieved 2021-07-30. This means Sallen-Key filters, state-variable variable filters, multiple feedback filters and other types are all biquads
Electronic_filter_topology
Measure of energy in a thermodynamic system
function H(S, p), with its entropy S[p] and its pressure p as natural state variables which provide a differential relation for dH of the simplest form,
Enthalpy
Equation in mathematical physics
transitions. The equation describes the time evolution of a scalar-valued state variable η {\displaystyle \eta } on a domain Ω {\displaystyle \Omega } during
Allen–Cahn_equation
Artificial neural network that mimics neurons
the firing threshold is reached—the neuron fires. After firing, the state variable is reset to a lower value. Various decoding methods exist for interpreting
Spiking_neural_network
Environment which allows specification of state machines for software using multivalued variables. A state variable in the VFSM environment may have one or
Virtual_finite-state_machine
Type of probabilistic logic
binary state variable, and can be represented as a Beta PDF (Probability Density Function). A multinomial opinion applies to a state variable of multiple
Subjective_logic
Method in programming
very different design methodology—Algorithmic State Machine design (ASM)—using Lyapunov state-variable mathematics, and derivative techniques pioneered
Algorithmic_state_machine
Energy contained within a system
function of state, its arguments are exclusively extensive variables of state, which is why it is sometimes called a cardinal function of state. Alongside
Internal_energy
Automotive transmission technology
A continuously variable transmission (CVT) is an automatic transmission that can change through a continuous range of gear ratios, typically resulting
Continuously variable transmission
Continuously_variable_transmission
Branch of engineering and mathematics
process variable (PV), and compares it with the reference or set point (SP). The difference between actual and desired value of the process variable, called
Control_theory
Thermodynamic concept imporant in astrophysics
with pressure dependent upon density, leaving only one independent state variable. A polytropic process is intermediate between an isothermal process
Polytrope
Variable defined outside any function block in C programming
B, an external variable is a variable defined outside any function block. On the other hand, a local (automatic) variable is a variable defined inside
External_variable
Computer program variable of undefined value
In computing, an uninitialized variable is a variable that is declared but is not set to a definite known value before it is used. It will have some value
Uninitialized_variable
Evolutionary algorithm
sampled solutions based on their fitness, 3) update of the internal state variables based on the re-ordered samples. A pseudocode of the algorithm looks
CMA-ES
Economic model of personal preferences
person, whose choices are not deterministic, but depend on a random state variable. A basic assumption in classic economics is that the choices of a rational
Random_utility_model
Maximized objective function of an optimization problem
{\displaystyle [t,t_{1}]} when started at the time- t {\displaystyle t} state variable x ( t ) = x {\displaystyle x(t)=x} . If the objective function represents
Value_function
Electronic filter circuit controlled with voltage
panel-mounted control. Its internal circuit was a classic analog computer state variable "loop", which provided outputs in quadrature. A VCF is an example of
Voltage-controlled_filter
Description of a system using mathematical concepts and language
depends on other variables too: decision variables, state variables, exogenous variables, and random variables. Decision variables are sometimes known
Mathematical_model
Nonlinear equation which arises on linear optimal control problems
control variables at any time can be found using the solution of the Riccati equation and the current observations on evolving state variables. With multiple
Algebraic_Riccati_equation
Type of regression analysis
such as mathematical operators, analytic functions, constants, and state variables. Usually, a subset of these primitives will be specified by the person
Symbolic_regression
Approximate method for the simulation of a stochastic system
x'(t))} is a Poisson distributed random variable with mean τ x ′ ( t ) {\displaystyle \tau x'(t)} . Given a state x ( t ) = { X i ( t ) } {\displaystyle
Tau-leaping
Property of having multiple stable equilibrium points
simplest form of multistability, and can occur in systems with only one state variable, as it only takes a one-dimensional space to separate two points. Near
Multistability
Formal method for the development of computer-based systems
someStateRegister = someStateRegister~ + i Where the ~ symbol on the state variable in the postcondition indicates the value of the state variable before
Vienna_Development_Method
Programming which all objects are created by classes
of state (variables) and behavior (methods) that are each either associated with a particular object or with all objects of that class. Object state can
Class_(programming)
Ecological concept
Ecosystems can shift from one state to another via a significant perturbation directly to state variables. State variables are quantities that change quickly
Alternative_stable_state
U.S. state
sales tax rates increase the taxes paid by consumers, depending on the variable local sales tax rates, generally between 7.5% and 10%. As of 2024[update]
Washington_(state)
Technique for designing controllers
on extension of the system model with an additional and fictitious state variable representing everything that the user does not include in the mathematical
Active disturbance rejection control
Active_disturbance_rejection_control
Game in structural combinatorics
combinatorics. Each vertex has the number of "chips" indicated by its state variable. On each firing, a vertex is selected and one of its chips is transferred
Chip-firing_game
Function in thermodynamics and statistical physics
functions of the thermodynamic state variables, such as the temperature and volume. Most of the aggregate thermodynamic variables of the system, such as the
Partition function (statistical mechanics)
Partition_function_(statistical_mechanics)
Type of quantum mechanics theory
additional, possibly inaccessible, variables. The mathematical formulation of quantum mechanics assumes that the state of a system prior to measurement
Hidden-variable_theory
Placeholder variables in programming
metasyntactic variables in computer programming or computer-related documentation. They have been used to name entities such as variables, functions, and
Foobar
Flow graph invented by Claude Shannon
flow in various electronic networks and amplifiers, digital filters, state-variable filters and some other types of analog filters. In nearly all literature
Signal-flow_graph
Programming paradigm entirely based on functions
functions. Program state and mutable objects are usually modeled with temporal logic, as explicit variables that represent the program state at each step of
Purely_functional_programming
Inference algorithm for probabilistic graphical models
of maximum a posteriori (MAP) state or estimation of conditional or marginal distributions over a subset of variables. The algorithm has exponential
Variable_elimination
Semi-modular analogue synthesizer
saw waveforms ranging from 8Hz to 8KHz (16KHz max with LFO/CV), one state-variable (low- and high-pass) voltage controlled filter, and a white noise generator
Mother-32
Concept in mathematics or computer science
science, a variable may be said to be either free or bound. Some older books use the terms real variable and apparent variable for free variable and bound
Free variables and bound variables
Free_variables_and_bound_variables
Variables Control
control is a variable chosen by the controller or agent to manipulate state variables, similar to an actual control valve. Unlike the state variable, it does
Control (optimal control theory)
Control_(optimal_control_theory)
Inference algorithm for hidden Markov models
Markov models which computes the posterior marginals of all hidden state variables given a sequence of observations/emissions o 1 : T := o 1 , … , o T
Forward–backward_algorithm
Branch of artificial intelligence
Classical Planning, are based on state variables. Each possible state of the world is an assignment of values to the state variables, and actions determine how
Automated planning and scheduling
Automated_planning_and_scheduling
Facts provided or learned about something or someone
only if, given its state variables for some initial period, the theory logically determines a unique set of values for those variables for any other period
Information
Linked cyclic series of thermodynamic processes
pressure, temperature, and other state variables within the system, and that eventually returns the system to its initial state. In the process of passing through
Thermodynamic_cycle
Concept in game theory
rather than in discrete steps, and for which the rate of change of each state variable—like position, speed, or resource level—is governed by a differential
Differential_game
Mathematical model of computation
implementation requires a register to store state variables, a block of combinational logic that determines the state transition, and a second block of combinational
Finite-state_machine
Computer modeling of time-varying behavior of a dynamical system
the state variables. Simulation of dynamic systems predicts the values of model-system state variables, as they are determined by the past state values
Dynamical_system_simulation
Growth rate relative to size
relevant in cases where the increase in a state variable over time is proportional to the value of that state variable at the beginning of a time period. In
Relative_growth_rate
an endpoint constraint on the state variables. Pontryagin's maximum principle Beavis, Brian; Dobbs, Ian (1990). "Variable Endpoints and Transversality
Transversality_condition
Class of statistical modeling methods
observed variables X {\displaystyle X} represents a sequence of observations and Y {\displaystyle Y} represents a hidden (or unknown) state variable that
Conditional_random_field
minimum number of state variables required to describe a system equals the order of the differential equation; more state variables than the minimum can
Minimal_realization
Characterized by some of the outputs or internal states growing without bounds
state variable in a system is said to be unstable if it evolves without bounds. A system itself is said to be unstable if at least one of its state variables
Instability
Types of quantities in financial fields
(say, December 31, 2004), which may have accumulated in the past. A flow variable is measured over an interval of time. Therefore, a flow would be measured
Stock_and_flow
Office skyscraper in Manhattan, New York
Center, or the Woolworth Building, despite being more expensive. There are variable charges to enter the observatories based on demand and time of day. Though
Empire_State_Building
Equation describing a state of matter under a given set of conditions
physics and chemistry, an equation of state is a thermodynamic equation relating state variables, which describe the state of matter under a given set of physical
Equation_of_state
Graphical representation of energy flows in physical systems
use the concept of analogous power conjugate variables whose product is energy flow, or power; these variable pairs are called effort and flow and, for example
Bond_graph
Law of physics
x)|\to 0} where Δ x {\displaystyle \Delta x} represents a change in the state variable x {\displaystyle x} . The unattainability principle of Nernst: It is
Third_law_of_thermodynamics
STATE VARIABLE
STATE VARIABLE
Surname or Lastname
English and Irish
English and Irish : variant of Stacey.
Boy/Male
Celebrity, Hindu, Indian, Telugu
State
Girl/Female
Muslim
Wealth, Empire, State
Boy/Male
Arabic
Leadership; State
Boy/Male
Arabic
Leadership; State
Male
English
English surname transferred to unisex forename use, TATE means "cheerful."
Girl/Female
English Scandinavian Anglo Saxon Irish
Brings joy.
Surname or Lastname
English
English : metonymic occupational name for a slater, from Middle English slate ‘slate’.
Surname or Lastname
Indian (northern states)
Indian (northern states) : Hindu name meaning ‘lamp’, from Sanskrit dīpa. It occurs commonly as the final element of compound personal names, e.g. in Kuldeep ‘light of the family’. Subsequently, it appears to have evolved into a surname.English : presumably from the adjective deep, either a topographic name for someone who lived in a deep valley, or perhaps a nickname for a ‘deep’, thoughtful person.
Surname or Lastname
English
English : from the Old English personal name TÄta, possibly a short form of various compound names with the obscure first element tÄt, or else a nursery formation. This surname is common and widespread in Britain; the chief area of concentration is northeastern England, followed by northern Ireland.
Boy/Male
Arabic
Power; State
Boy/Male
Arabic
State; Dignity
Boy/Male
Hindu, Indian
State; Country
Boy/Male
American, Anglo, Australian, British, Chinese, Christian, English, Finnish, German, Indian, Irish, Norse, Scandinavian
To be Cheerful; Great; Measure of Land; Great Talker
Girl/Female
Indian, Kashmiri
State Honour
Girl/Female
American, Anglo, Australian, British, English, Finnish, Irish, Scandinavian
Light Hearted; Cheerful; Pleasant and Bright; Brings Joy; Bright; Great; Measure of Land
Surname or Lastname
English
English : unexplained.
Boy/Male
Arabic
Power; State
Boy/Male
English Scandinavian American Irish Native American
Cheerful.
Boy/Male
Arabic
State; Condition
STATE VARIABLE
STATE VARIABLE
Girl/Female
Arabic, Muslim
Purity; Righteousness; Honesty
Girl/Female
Arabic
Of Spirit
Girl/Female
Hindu
Blue, Enchanting Moon
Boy/Male
Celebrity, German, Indian
Fire
Boy/Male
American, Australian, Biblical, British, Chinese, Christian, Danish, English, German, Greek, Latin
From the Forest or Woods; Three; The Third; Wood Dweller
Boy/Male
Arabic, Hindu, Indian, Muslim, Sindhi
Beautiful; Smart
Boy/Male
Muslim
One who warns, Bright, Radiant, Blooming, Observer, Supervisor
Boy/Male
Hindu
Sacrifice
Girl/Female
Hawaiian
Gentle caress.
Male
English
Anglicized form of Hebrew Chanan, CANAN means "compassionate, merciful." In the bible, this is the name of many characters, including a chief of the tribe of Benjamin.Â
STATE VARIABLE
STATE VARIABLE
STATE VARIABLE
STATE VARIABLE
STATE VARIABLE
n.
The bodies that constitute the legislature of a country; as, the States-general of Holland.
imp. & p. p.
of State
n.
One of several marked phases or periods in the development and growth of many animals and plants; as, the larval stage; pupa stage; zoea stage.
v. t.
To place, as a statue; to form a statue of; to make into a statue.
v. t.
To cover with slate, or with a substance resembling slate; as, to slate a roof; to slate a globe.
n.
Estate, possession.
n.
See Skate, for the foot.
v. t.
To pierce or wound with a stake.
n.
One who states.
v. t.
To endow with an estate.
n.
To break in a stave or the staves of; to break a hole in; to burst; -- often with in; as, to stave a cask; to stave in a boat.
n.
Rank; condition; quality; as, the state of honor.
n.
Estate; state.
v. t.
To exhibit upon a stage, or as upon a stage; to display publicly.
n.
The state; the general body politic; the common-wealth; the general interest; state affairs.
v. t.
To express the particulars of; to set down in detail or in gross; to represent fully in words; to narrate; to recite; as, to state the facts of a case, one's opinion, etc.
a.
Recurring at regular time; not occasional; as, stated preaching; stated business hours.
n.
Any body of men united by profession, or constituting a community of a particular character; as, the civil and ecclesiastical states, or the lords spiritual and temporal and the commons, in Great Britain. Cf. Estate, n., 6.
v. t.
To mark the limits of by stakes; -- with out; as, to stake out land; to stake out a new road.
a.
Belonging to the state, or body politic; public.