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Unit of measurement
The function point is a "unit of measurement" to express the amount of business functionality an information system (as a product) provides to a user.
Function_point
Response of an optical system to a point source of light
The point spread function (PSF) describes the response of a focused optical imaging system to an idealized point source of light. In casual terms, for
Point_spread_function
Mathematical function whose derivative exists
or complex function of a single variable is differentiable if its derivative exists at each point in its domain. For real-valued functions of a real variable
Differentiable_function
Mathematical function with no sudden changes
In mathematics, a continuous function is a function such that a small variation of its argument induces at most a small variation of its value. This implies
Continuous_function
Complex-differentiable (mathematical) function
holomorphic function is a complex-valued function of one or more complex variables that is complex differentiable in a neighbourhood of each point in a domain
Holomorphic_function
Software metrics association
The International Function Point Users Group (IFPUG) is a US-based organization with worldwide chapters of function point analysis metric software users
IFPUG
Topics referred to by the same term
Look up function or functionality in Wiktionary, the free dictionary. Function or functionality may refer to: Function key, a type of key on computer keyboards
Function
Type of function in mathematics
analytic function is a function that is locally represented by a convergent power series. More precisely, a real or complex function is analytic at a point if
Analytic_function
802.11-based WLAN medium access control method
Point Coordination Function (PCF) is a media access control (MAC) technique used in IEEE 802.11 based WLANs, including Wi-Fi. It resides in a point coordinator
Point_coordination_function
distributed point function is a cryptographic primitive that allows two distributed processes to share a piece of information, and compute functions of their
Distributed_point_function
Refers to two related but distinct notions: functional quality and structural quality
(development cost per function point; delivered defects per function point; function points per staff month.). The function point analysis sizing standard
Software_quality
Polynomial function of degree 3
cubic function is strictly monotonic. See the figure for an example of the case Δ0 > 0. The inflection point of a function is where that function changes
Cubic_function
Association of one output to each input
mathematics, a function from a set X to a set Y assigns to each element of X exactly one element of Y. The set X is called the domain of the function and the
Function_(mathematics)
Statistical function that defines the quantiles of a probability distribution
quantile function is also called the percentile function (after the percentile), percent-point function, inverse cumulative distribution function or inverse
Quantile_function
The Simple Function Point (SFP) method is a lightweight Functional Measurement Method. The Simple Function Point method was designed by Roberto Meli in
The Simple Function Point method
The_Simple_Function_Point_method
Topics referred to by the same term
Weierstrass function may refer to: Weierstrass function (nowhere-differentiable function) Weierstrass sigma, zeta, and eta functions Weierstrass elliptic
Weierstrass_function
Generalized function whose value is zero everywhere except at zero
distributions. The delta function is named after physicist Paul Dirac, and has been applied routinely in physics and engineering to model point masses and concentrated
Dirac_delta_function
Theorem in mathematics
to the function at a point is invertible, then with sufficient regularity assumptions, the function should also be invertible near that point. In its
Inverse_function_theorem
Point where the derivative of a function is zero or undefined (in certain cases)
critical point is the argument of a function where the function derivative is zero (or undefined, as specified below). The value of the function at a critical
Critical_point_(mathematics)
Point where the curvature of a curve changes sign
changes sign. In particular, in the case of the graph of a function, it is a point where the function changes from being concave (concave downward) to convex
Inflection_point
Computer industry standards consortium
for automating the popular function point measure according to the counting guidelines of the International Function Point User Group (IFPUG). On March
Object_Management_Group
Mathematical function having a characteristic S-shaped curve or sigmoid curve
sigmoid function is any mathematical function whose graph has a characteristic S-shaped or sigmoid curve. A common example of a sigmoid function is the
Sigmoid_function
Description of continuous random distribution
density function (PDF), density function, or simply density of an absolutely continuous random variable, is a function whose value at any given point in the
Probability_density_function
Measurement of the size of non-functional software
sizing of functional software. SNAP is a product of the International Function Point Users Group (IFPUG), and is sized using the “Software Non-functional
SNAP_Points
Lightweight programming language
related functions, it can act as a namespace. Point = {} Point.new = function(x, y) return {x = x, y = y} -- return {["x"] = x, ["y"] = y} end Point.set_x
Lua
Function describing equilibrium states of a system
thermodynamics of equilibrium, a state function, function of state, or point function for a thermodynamic system is a function relating several state variables
State_function
Critical point on a surface graph which is not a local extremum
In mathematics, a saddle point or minimax point is a point on the surface of the graph of a function where the slopes (derivatives) in orthogonal directions
Saddle_point
Generalized mathematical function
has two or more values in its range for at least one point in its domain. It is a set-valued function with additional properties depending on context; though
Multivalued_function
Software engineering activity
SERIES AND RELATED INTERNATIONAL STANDARDS Uses and Benefits of Function Point Counts - Pam Morris Total Metrics - Function Point Resource Centre, PDF
Software_sizing
Quickly growing function
primitive recursive functions f1,f2,… selected from the Grzegorczyk hierarchy. This makes the Ackermann function the first limit point fω of the fast-growing
Ackermann_function
Mathematical approximation of a function
of a function is an infinite sum of terms that are expressed in terms of the function's derivatives at a single point. For most common functions, the
Taylor_series
Instantaneous rate of change (mathematics)
tangent line to the graph of the function at that point. The tangent line is the best linear approximation of the function near that input value. The derivative
Derivative
Fixed-point theorem for set-valued functions
Kakutani fixed-point theorem is a fixed-point theorem for set-valued functions. It provides sufficient conditions for a set-valued function defined on a
Kakutani_fixed-point_theorem
Random set of points on a space with random number and random position
^{d}} . A point process transformation is a function that maps a point process to another point process. We shall see some examples of point processes
Point_process
Special function in the physical sciences
mathematics, the Airy function (or Airy function of the first kind) A i ( x ) {\displaystyle \mathbf {Ai({\boldsymbol {x}})} } is a special function named after
Airy_function
Largest and smallest value taken by a function at a given point
minimum point at x∗, if f(x∗) ≤ f(x) for all x in X. The value of the function at a maximum point is called the maximum value of the function, denoted
Maximum_and_minimum
Computing the fixed point of a function
Fixed-point computation refers to the process of computing an exact or approximate fixed point of a given function. In its most common form, the given
Fixed-point_computation
Higher-order function which returns some fixed point of the input function
computer science, a fixed-point combinator (or fixpoint combinator) is a higher-order function (i.e., a function that takes a function as argument) that returns
Fixed-point_combinator
Point in a computer program where instruction-execution begins
systems and programming languages, the entry point is in a runtime library, a set of support functions for the language. The library code initializes
Entry_point
Element mapped to itself by a mathematical function
transformation. Specifically, for functions, a fixed point is an element that is mapped to itself by the function. Any set of fixed points of a transformation
Fixed_point_(mathematics)
Mathematical result on ordinals
The fixed-point lemma for normal functions is a basic result in axiomatic set theory stating that any normal function has arbitrarily large fixed points
Fixed-point lemma for normal functions
Fixed-point_lemma_for_normal_functions
Mathematical description of quantum state
mechanical waves. Wave functions are complex-valued. For example, a wave function might assign a complex number to each point in a region of space. The
Wave_function
Zero of the derivative of a function
calculus, a stationary point of a differentiable function of one variable is a point on the graph of the function where the function's derivative is zero
Stationary_point
Function with a multiplicative scaling behaviour
mathematics, a homogeneous function is a function of several variables such that the following holds: If each of the function's arguments is multiplied by
Homogeneous_function
encounters or makes contact with a point of a point process. Nearest neighbor function are used in the study of point processes as well as the related fields
Nearest neighbour distribution
Nearest_neighbour_distribution
Point of interest for complex multi-valued functions
branch point of a multivalued function is a point such that if the function is n {\displaystyle n} -valued (has n {\displaystyle n} values) at that point, all
Branch_point
an (actual) point at infinity. A function f:X→ℂ on a normed vector space (X,‖⋅‖) is said to vanish at infinity if the values of the function approach 0
Vanish_at_infinity
Fundamental trigonometric functions
the only real fixed point of the sine function; in other words the only intersection of the sine function and the identity function is sin(0)=0. The only
Sine_and_cosine
Function that is continuous everywhere but differentiable nowhere
mathematics, the Weierstrass function, named after its discoverer, Karl Weierstrass, is an example of a real-valued function that is continuous everywhere
Weierstrass function (nowhere-differentiable function)
Weierstrass_function_(nowhere-differentiable_function)
Condition for a mathematical function to map some value to itself
In mathematics, a fixed-point theorem is a result saying that a function F will have at least one fixed point (a point x for which F(x) = x), under some
Fixed-point_theorem
Matrix of second derivatives
critical point of a function, is equal to the Gaussian curvature of the function considered as a manifold. The eigenvalues of the Hessian at that point are
Hessian_matrix
Order-preserving mathematical function
In mathematics, a monotonic function (or monotone function) is a function between ordered sets that preserves or reverses the given order. This concept
Monotonic_function
Assignment of numbers to points in space
In mathematics and physics, a scalar field is a function associating a single number to each point in a region of space – possibly physical space. The
Scalar_field
Class of mathematical function
these zeros. From an algebraic point of view, if the function's domain is connected, then the set of meromorphic functions is the field of fractions of
Meromorphic_function
Branch of mathematics studying functions of a complex variable
each point of its domain. This makes methods and results of complex analysis significantly different from those of real analysis. Complex functions also
Complex_analysis
Polynomial function of degree two
In mathematics, a quadratic function of a single variable is a function of the form f ( x ) = a x 2 + b x + c {\displaystyle f(x)=ax^{2}+bx+c} with
Quadratic_function
Characteristic of an optical system
transfer function is defined as the Fourier transform of the point spread function (PSF, that is, the impulse response of the optics, the image of a point source)
Optical_transfer_function
Amount of variation between extrema
sequence of real numbers, oscillation of a real-valued function at a point, and oscillation of a function on an interval (or open set). Let ( a n ) {\displaystyle
Oscillation_(mathematics)
Functions in mathematics
\Delta f=0} The descriptor "harmonic" in the name "harmonic function" originates from a point on a taut string which is undergoing harmonic motion. The
Harmonic_function
Negative of a convex function
domain of a function, the function must be concave; as a partial converse, if the derivative of a strictly concave function is zero at some point, then that
Concave_function
Extension of the factorial function
The gamma function then is defined in the complex plane as the analytic continuation of this integral function: it is a meromorphic function which is holomorphic
Gamma_function
Function describing the distribution of galaxies in the universe
function" refers to the two-point autocorrelation function. The two-point autocorrelation function is a function of one variable (distance); it describes the
Correlation function (astronomy)
Correlation_function_(astronomy)
Point to which functions converge in analysis
mathematics, the limit of a function is a fundamental concept in calculus and analysis concerning the behavior of that function near a particular input which
Limit_of_a_function
Topics referred to by the same term
Critical point (mathematics), a stationary point of a function of an arbitrary number of variables Point-free geometry Stationary point, a point in a single-valued
Point
Process in software development
at the Wayback Machine Morris Pam — Overview of Function Point Analysis Total Metrics - Function Point Resource Centre Srinivasa Gopal and Meenakshi D'Souza
Software development effort estimation
Software_development_effort_estimation
Root-finding algorithm
numerical analysis, fixed-point iteration is a method of computing fixed points of a function. More specifically, given a function f {\displaystyle f} defined
Fixed-point_iteration
Function returning minus 1, zero or plus 1
In mathematics, the sign function or signum function (from signum, Latin for "sign") is a function that has the value −1, +1 or 0 according to whether
Sign_function
Function specifying the behavior of a component in an electronic or control system
a transfer function (also known as system function or network function) of a system, sub-system, or component is a mathematical function that models
Transfer_function
Family of solutions to related differential equations
Bessel functions are a class of special functions that commonly appear in problems involving wave motion, heat conduction, and other physical phenomena
Bessel_function
Function used as a performance test problem for optimization algorithms
In mathematical optimization, the Rosenbrock function is a non-convex function, introduced by Howard H. Rosenbrock in 1960, which is used as a performance
Rosenbrock_function
Arctangent function with two arguments
±π (a half turn) must be added to place the point in the correct quadrant. Using the atan2 function does away with this correction, simplifying code
Atan2
Counterexample to the converse of the intermediate value theorem
it is an everywhere surjective function. It is thus discontinuous at every point. Conway's creation of the function has been attested to by the mathematician
Conway's_base_13_function
Matrix of partial derivatives of a vector-valued function
differentiable inverse function in a neighborhood of a point x if and only if the Jacobian determinant is nonzero at x (see inverse function theorem for an explanation
Jacobian matrix and determinant
Jacobian_matrix_and_determinant
Mathematical function, denoted exp(x) or e^x
In mathematics, the exponential function is the unique real function which maps zero to one and has a derivative everywhere equal to its value. It is denoted
Exponential_function
Mapping theorem in topology
coincidence points of functions. There are different versions of this theorem: the weak version shows only the existence of a fixed point when a expression
Lefschetz_fixed-point_theorem
Method of solution to differential equations
In mathematics, a Green's function (or Green function) is the impulse response of an inhomogeneous linear differential operator defined on a domain with
Green's_function
Multivariate derivative (mathematics)
scalar-valued differentiable function f of several variables is the vector field (or vector-valued function) whose value at a point p gives the direction and
Gradient
C standard library header file
of the mathematical functions, which use floating-point numbers, are defined in <math.h> (<cmath> header in C++). The functions that operate on integers
C_mathematical_functions
On converting relations to functions of several real variables
F(x,y)=0} can also be specified as the graph of a function f {\displaystyle f} , so that for each point ( x , y ) {\displaystyle (x,y)} on part of the curve
Implicit_function_theorem
Smooth and compactly supported function
analysis, a bump function is a localized auxiliary function, usually chosen to be smooth and to have compact support. Bump functions are commonly used
Bump_function
S-shaped curve
logistic function is thus rotationally symmetrical about the point (0, 1/2). The logistic function is the inverse of the natural logit function logit
Logistic_function
Functions of an angle
mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) are real functions which relate an angle of
Trigonometric_functions
Mathematical function in general imaging
The contrast transfer function (CTF) mathematically describes how aberrations in a transmission electron microscope (TEM) modify the image of a sample
Contrast_transfer_function
IT industry group
maintainability of IT software. In January 2013, OMG adopted Automated Function Point specifications. In May 2013 CISQ reached 500 members. In December 2013
CISQ
of special functions which developed out of statistics and mathematical physics. A modern, abstract point of view contrasts large function spaces, which
List of mathematical functions
List_of_mathematical_functions
Concept in the analysis of dynamical systems
^{n}&\\{\dot {y}}=g(y)\end{cases}}} with an equilibrium point at y = 0 {\displaystyle y=0} is a scalar function V : R n → R {\displaystyle V:\mathbb {R} ^{n}\to
Lyapunov_function
Replacement, insertion, or deletion of a single DNA or RNA nucleotide
frameshift mutations), with regard to protein production, composition, and function. Point mutations usually take place during DNA replication. DNA replication
Point_mutation
Theorem in topology
Brouwer's fixed-point theorem is a fixed-point theorem in topology, named after L. E. J. Brouwer. It states that for any continuous function f mapping a nonempty
Brouwer_fixed-point_theorem
Mathematical functions which are smooth but not analytic
analysis, a smooth function is infinitely differentiable at each point in its domain, while a real analytic function is, at each point in its domain, the
Non-analytic_smooth_function
Type of mathematical function
mathematics, a locally constant function is a function from a topological space into a set with the property that around every point of its domain, there exists
Locally_constant_function
Result of repeatedly applying a mathematical function
In mathematics, an iterated function is a function that is obtained by composing another function with itself two or several times. The process of repeatedly
Iterated_function
Distance from a point to the boundary of a set
applications, the signed distance function or signed distance field (SDF) is the orthogonal distance of a given point x to the boundary of a set Ω in a
Signed_distance_function
Expectation value of time-ordered quantum operators
{\displaystyle |\Omega \rangle } at every event x in spacetime, the n-point correlation function is the vacuum expectation value of the time-ordered products of
Correlation function (quantum field theory)
Correlation_function_(quantum_field_theory)
Function which is not continuous at any point of its domain
nowhere continuous function, also called an everywhere discontinuous function, is a function that is not continuous at any point of its domain. If f
Nowhere_continuous_function
Cluster point in a topological space
concept Isolated point – Point of a subset S around which there are no other points of S Limit of a function – Point to which functions converge in analysis
Accumulation_point
Continuous function that is not absolutely continuous
In mathematics, the Cantor function is an example of a function that is continuous, but not absolutely continuous. It is a notorious counterexample in
Cantor_function
system. The MK II Method (ISO/IEC 20968 Software engineering—Mk II Function Point Analysis—Counting Practices Manual) is one of five currently recognized
MK_II_FPA
Mathematical function such that every output has at least one input
surjective function (also known as surjection, or onto function /ˈɒn.tuː/) is a function f such that, for every element y of the function's codomain, there
Surjective_function
Type of random mathematical object
the point process is transformed) according to some function to another underlying space, then the resulting point process is also a Poisson point process
Poisson_point_process
Point which a function/system returns to after some time or iterations
iterated functions and dynamical systems, a periodic point of a function is a point which the system returns to after a certain number of function iterations
Periodic_point
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