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Type of mathematical function
piecewise linear or segmented function is a real-valued function of a real variable, whose graph is composed of straight-line segments. A piecewise linear
Piecewise_linear_function
Function defined by multiple sub-functions
of "piecewise". Terms like piecewise linear, piecewise smooth, piecewise continuous, and others are also very common. The meaning of a function being
Piecewise_function
Linear combination of indicator functions of real intervals
intervals. Informally speaking, a step function is a piecewise constant function having only finitely many pieces. A function f : R → R {\displaystyle f\colon
Step_function
Linear map or polynomial function of degree one
graph of the function must pass through the origin. Homogeneous function Nonlinear system Piecewise linear function Linear approximation Linear interpolation
Linear_function
Topological manifold with a piecewise linear structure on it
an atlas, such that one can pass from chart to chart in it by piecewise linear functions. This is slightly stronger than the topological notion of a triangulation
Piecewise_linear_manifold
Topics referred to by the same term
Piecewise linear may refer to: Piecewise linear curve, a connected sequence of line segments Piecewise linear function, a function whose domain can be
Piecewise_linear
Method of curve fitting
higher-dimensional piecewise linear functions (see second figure below). Many libraries and shading languages have a "lerp" helper-function (in GLSL known
Linear_interpolation
Tent function, often used in signal processing
x_{j+1}=1} . A linear B-spline is the same as a continuous piecewise linear function f ( x ) {\displaystyle f(x)} , and this general triangle function is useful
Triangular_function
Piece-wise division of objects
A piecewise-constant valuation is a kind of a function that represents the utility of an agent over a continuous resource, such as land. It occurs when
Piecewise-constant_valuation
Model in digital signal processing
circuit called an integrator. For FOH, the signal is reconstructed as a piecewise linear approximation to the original signal that was sampled. A mathematical
First-order_hold
to 1, but using simpler functions, especially piecewise linear functions or piecewise constant functions. These are preferred where speed of computation
Hard_sigmoid
Numerical method for solving physical or engineering problems
chooses basis functions. We used piecewise linear basis functions in our discussion, but it is common to use piecewise polynomial basis functions. Separate
Finite_element_method
Mathematical function conceived as a crude model
they may also take the form of other nonlinear functions, piecewise linear functions, or step functions. They are also often monotonically increasing,
Artificial_neuron
Set of functions between two fixed sets
functions B M O ( Ω ) {\displaystyle BMO(\Omega )} , space of bounded mean oscillation. Also called John–Nirenberg space linear functions piecewise linear
Function_space
Topics referred to by the same term
Examples of functions with such piecewise properties are: Piecewise constant function, also known as a step function Piecewise linear function Piecewise continuous
Piecewise_property
Statistical method of dividing data into equal-sized intervals for analysis
floor and ceiling functions). The first three are piecewise constant, changing abruptly at each data point, while the last six use linear interpolation between
Quantile
Connected series of line segments
be partitioned into exactly two monotone chains. The graphs of piecewise linear functions form monotone chains with respect to a horizontal line. Each segment
Polygonal_chain
details. Let K and L be two GSCs. A function f : | K | → | L | {\displaystyle f:|K|\to |L|} is called piecewise-linear (PL) if there exist a subdivision
Simplicial_map
Non-sinusoidal waveform
the extreme case of an asymmetric triangle wave. The equivalent piecewise linear functions x ( t ) = t − ⌊ t ⌋ {\displaystyle x(t)=t-\lfloor t\rfloor } x
Sawtooth_wave
Function that is continuous everywhere but differentiable nowhere
the cosine function can be replaced in the infinite series by a piecewise linear "zigzag" function. G. H. Hardy showed that the function of the above
Weierstrass function (nowhere-differentiable function)
Weierstrass_function_(nowhere-differentiable_function)
Indicator function of positive numbers
and represented the function as 1. Taking the convention that H(0) = 1, the Heaviside function may be defined as: A piecewise function: H ( x ) := { 1 ,
Heaviside_step_function
Algorithm for generating pseudo-randomized numbers
A linear congruential generator (LCG) is an algorithm that yields a sequence of pseudo-randomized numbers calculated with a discontinuous piecewise linear
Linear_congruential_generator
Exponent of a power of two
of approximately 0.44. It can be made more accurate by using a piecewise linear function of m {\displaystyle m} , or more crudely by adding a constant
Binary_logarithm
Mapping arbitrary data to fixed-size values
poorly designed hash functions can result in access times approaching linear in the number of items in the table. Hash functions can be designed to give
Hash_function
Type of mathematical function
elementary, such as piecewise-defined functions. More generally, in some modern treatments, elementary functions comprise the set of functions previously enumerated
Elementary_function
Type of activation function
(rectified linear unit) activation function is an activation function defined as the non-negative part of its argument, i.e., the ramp function: ReLU (
Rectified_linear_unit
Array of numbers
It attempts to approximate the solution to some equation by piecewise linear functions, where the pieces are chosen concerning a sufficiently fine grid
Matrix_(mathematics)
Topological manifold with a piecewise smooth structure
smooth manifolds and smooth functions between them) and in PL (the category of piecewise linear manifolds and piecewise linear maps between them), allowing
Piecewise-smooth_manifold
Simplicial continuation, or piecewise linear continuation (Allgower and Georg), is a one-parameter continuation method which is well suited to small to
Piecewise_linear_continuation
First known wavelet basis
k<2^{n}.} These functions sn,k are continuous, piecewise linear, supported by the interval In,k that also supports ψn,k. The function sn,k is equal to 1
Haar_wavelet
Doubling map on the unit interval
transformation can also be defined as the iterated function map of the piecewise linear function T ( x ) = { 2 x 0 ≤ x < 1 2 2 x − 1 1 2 ≤ x < 1. {\displaystyle
Dyadic_transformation
Mathematical function defined piecewise by polynomials
In mathematics, a spline is a function defined piecewise by polynomials. In interpolating problems, spline interpolation is often preferred to polynomial
Spline_(mathematics)
of a positive integer. Constant function: polynomial of degree zero, graph is a horizontal straight line Linear function: First degree polynomial, graph
List of mathematical functions
List_of_mathematical_functions
smooth functions are not piecewise linear, nor are piecewise linear functions smooth, except for globally linear functions. The set of piecewise-smooth
Maps_of_manifolds
Type of numerical analysis
interpolate linearly between the points ( x i , y ^ i ) {\displaystyle (x_{i},{\hat {y}}_{i})} , as illustrated in the figure, yielding a continuous piecewise linear
Isotonic_regression
coordinate system. Then a polyhedral terrain is the image of a piecewise-linear function in x and y variables. The polyhedral terrain is a generalization
Polyhedral_terrain
prescribed exact solution consists of displacements that vary as piecewise linear functions in space (called a constant strain solution). The elements pass
Patch_test_(finite_elements)
Generalized function whose value is zero everywhere except at zero
numerical analysis, a piecewise linear approximation to the identity is desirable. This can be obtained by taking η1 to be a hat function. With this choice
Dirac_delta_function
Piecewise function that clamps its input to be non-negative
the ramp function. The ramp function (R(x) : R → R0+) may be defined analytically in several ways. Possible definitions are: A piecewise function: R ( x
Ramp_function
Family of second-order differential equations
Liénard system with piecewise-linear functions can also contain homoclinic orbits. Let f and g be two continuously differentiable functions on R , {\displaystyle
Liénard_equation
is completed. These knees in functions are defined by piecewise functions. Below is an exemplary piecewise linear function defining that as soon as x equals
Bulk_dispatch_lapse
Loss function used in robust regression
The Huber loss function describes the penalty incurred by an estimation procedure f. Huber (1964) defines the loss function piecewise by L δ ( a ) = {
Huber_loss
Mathematical method in functional analysis
{\displaystyle {\mathcal {PC}}} denote the space of bounded, piecewise continuous functions on [ a , b ] {\displaystyle [a,b]} that are continuous from
Continuous_linear_extension
Graph of wealth or income distribution
{\displaystyle f(y_{j}):=\Pr(Y=y_{j})} the Lorenz curve is the continuous piecewise linear function connecting the points (Fi, Li), i = 0 to n, where F0 = 0, L0 =
Lorenz_curve
Any mathematical model describing semiconductor diodes
diode is called piecewise linear (PWL) modelling. In mathematics, this means taking a function and breaking it down into several linear segments. This
Diode_modelling
Integral transform and linear operator
be mitigated by use of a window function to taper h ~ [ n ] {\displaystyle {\tilde {h}}[n]} to zero. Method 2: Piecewise convolution. It is well known that
Hilbert_transform
Replacing a number with a simpler value
same value). In the general case of a discrete range, they are piecewise constant functions. Typical rounding problems include: The most basic form of rounding
Rounding
Non-sinusoidal waveform
waveform named for its triangular shape. It is a periodic, piecewise linear, continuous real function. Like a square wave, the triangle wave contains only odd
Triangle_wave
Representation of mathematical space
a triangulable space. Triangulations can also be used to define a piecewise linear structure for a space, if one exists. Triangulation has various applications
Triangulation_(topology)
temperature stability and other non-ideal effects. Piecewise linear functions can approximate non-linear functions as a series of connected line segments. Gain
Operational amplifier applications
Operational_amplifier_applications
Mathematical rule
continuity is important. Without this assumption, the discontinuous piecewise linear function f : [ 0 , 3 ) → [ 0 , 3 ) {\displaystyle f:[0,3)\to [0,3)} defined
Sharkovskii's_theorem
Arithmetic operation
function of the function exp a {\displaystyle \exp _{a}} . The proof is that the second through fourth conditions trivially imply that f is a linear function
Tetration
function (e.g. arcsine is the inverse of sine). Implicit function: defined implicitly by a relation between the argument(s) and the value. Piecewise function:
List_of_types_of_functions
Method in numerical analysis
continuation must be used (see below). Simplicial Continuation, or Piecewise Linear Continuation (Allgower and Georg) is based on three basic results.
Numerical_continuation
real-valued functions defined on the unit interval, but equip X with the L1 norm and Y with the supremum norm. For n ∈ N, let fn be the continuous, piecewise linear
Continuous_embedding
Type of function in mathematics
nonempty open subset of C {\displaystyle \mathbb {C} } . Piecewise defined functions (functions given by different formulae in different regions) are typically
Analytic_function
Function used in signal processing
astronomy, inspired by the Planck distribution. It is defined as a piecewise function: w [ 0 ] = 0 , w [ n ] = ( 1 + exp ( ε N n − ε N ε N − n ) ) − 1
Window_function
Operation in calculus
Although all bounded piecewise continuous functions are Riemann-integrable on a bounded interval, subsequently more general functions were considered—particularly
Integral
Wavelet constructed using a spline function
(}(N_{2}(2x+k-1)-2N_{2}(2x+k-2)+N_{2}(2x+k-3){\Big )}} The following piecewise linear function is the approximation to ψ 2 ( x ) {\displaystyle \psi _{2}(x)}
Spline_wavelet
Concept in statistical mathematics
Segmented regression, also known as piecewise regression or broken-stick regression, is a method in regression analysis in which the independent variable
Segmented_regression
Every graph has evenly many odd vertices
the motion. One proof of this involves approximating the function by a piecewise linear function with the same extreme points, parameterizing the position
Handshaking_lemma
Electrical circuit
until the first limits. The resulting curve is a piecewise linear function approximation of the log function. If limiting amplifiers that clip "softly" are
Log_amplifier
Multivalued function in mathematics
W function by piecewise minimax rational function approximation with variable transformation. doi:10.13140/RG.2.2.30264.37128. "Lambert W Functions -
Lambert_W_function
Method for estimating new data within known data points
interpolation is a generalization of linear interpolation. Note that the linear interpolant is a linear function. We now replace this interpolant with
Interpolation
Degree of differentiability of a function or map
theory) Smoothing – Fitting an approximating function to data Spline – Mathematical function defined piecewise by polynomials Sobolev mapping Warner, Frank
Smoothness
Topics referred to by the same term
terms remains constant throughout Linear spline, a function defined piecewise by polynomials of degree (at most) 1 Linear term, a component of a formula
Linear_(disambiguation)
Measure of air pollution
calculated using breakpoint concentrations below, and using same piecewise linear function to calculate intermediate values as the US AQI scale. and The
Air_quality_index
Determining all voltages and currents within an electrical network
junction voltage in amplifier design. The piecewise method is similar to the small signal method in that linear network analysis techniques can only be
Network analysis (electrical circuits)
Network_analysis_(electrical_circuits)
World spatial reference system co-rotating with the Earth in its diurnal motion in space
parametric fits are to model post-seismic deformation as opposed to the traditional approach using piecewise linear functions. ITRF2020 2015.0 9988 9989 9990
International Terrestrial Reference System and Frame
International_Terrestrial_Reference_System_and_Frame
Algorithm for measuring similarity between temporal sequences
where the fluctuations in the time axis are modeled using a non-linear time-warping function. Considering any two speech patterns, we can get rid of their
Dynamic_time_warping
Economical computational problem
is a piecewise linear function of xj. This assumption is common in computer science, as it allows a finite representation of the utility functions. Utilities
Market equilibrium computation
Market_equilibrium_computation
Type of artificial neural network architecture
low-frequency data components. Piecewise linear functions: Provide efficient approximation for multivariate functions in KANs. Recent RBF–KAN implementations
Kolmogorov–Arnold_Networks
(but piecewise continuous) nonlinearity (e.g., an amplifier with saturation, or an element with deadband effects) cascaded with a slow stable linear system
Describing_function
Numerical method for differential equations
local linearization (LL) method is a general strategy for designing numerical integrators for differential equations based on a local (piecewise) linearization
Local_linearization_method
System with self-optimizing transfer function
An adaptive filter is a system with a linear filter that has a transfer function controlled by variable parameters and a means to adjust those parameters
Adaptive_filter
Sequence of data points over time
the entire data set. Spline interpolation, however, yield a piecewise continuous function composed of many polynomials to model the data set. Extrapolation
Time_series
Differential calculus on function spaces
choosing piecewise linear functions that make a transition between −1 and 1 in a small neighborhood of the origin. However, there is no function that makes
Calculus_of_variations
Mathematical model of the time dependence of a point in space
with just second-degree polynomials; the horseshoe map is piecewise linear. For non-linear autonomous ODEs it is possible under some conditions to develop
Dynamical_system
Strong form of uniform continuity
metric on M or N. This structure is intermediate between that of a piecewise-linear manifold and a topological manifold: a PL structure gives rise to a
Lipschitz_continuity
Spline function
a fundamental building block for all spline functions of that degree. A B-spline is defined as a piecewise polynomial of order n {\displaystyle n} , meaning
B-spline
Average value of a random variable
of the general Lebesgue theory, due to the fact that every piecewise-continuous function is measurable. The expected value of any real-valued random
Expected_value
Interpolation on functions of more than one variable
neighbor Triangulated irregular network-based linear interpolation (a type of piecewise linear function) n-simplex (e.g. tetrahedron) interpolation (see
Multivariate_interpolation
Representing a 3D-modeled object or dataset as a 2D projection
and a color. This is done with a "transfer function" which can be a simple ramp, a piecewise linear function or an arbitrary table. Once converted to an
Volume_rendering
Standard for HDTV image encoding and signal characteristics
analog-to-digital converters. Thus the standard opted for a piecewise function that combines a simple linear function V = a L {\displaystyle V=a\,L} for low light levels
Rec._709
Property of functions which is weaker than continuity
( y , ∞ ] {\displaystyle (y,\infty ]} . Consider the function f , {\displaystyle f,} piecewise defined by: f ( x ) = { − 1 if x < 0 , 1 if x ≥ 0 {\displaystyle
Semi-continuity
the partition function P ( n 1 , n 2 ) {\displaystyle P(n_{1},n_{2})} can be defined piecewise with the help of two auxiliary functions. If n 1 ≤ n 2
Kostant_partition_function
Method for numerical differential equations
, in the sense that it is the piecewise constant function equal in each simplex to the gradient of the affine function in the simplex. The mixed finite
Gradient discretisation method
Gradient_discretisation_method
Electronic circuit that behaves chaotically
containing a nonlinear element such that f(x) was a 3-segment piecewise-linear function. The easy experimental implementation of the circuit, combined
Chua's_circuit
Type of plane curve
curves that are locally equivalent to the graphs of piecewise linear convex functions, but these functions are not strictly convex. There exist smooth open
Convex_curve
Non-parametric regression technique
the piecewise linear graph shown for the simple MARS model in the previous section. One might assume that only piecewise linear functions can be formed
Multivariate adaptive regression spline
Multivariate_adaptive_regression_spline
Mathematical method for approximating solutions to differential and integral equations
finite-dimensional subspace of piecewise linear functions (as in trapezoidal rule), or cubic functions, or other piecewise polynomial functions. In orthogonal collocation
Collocation_method
Computational statistics technique
least, closer to piecewise linear). Instead of a single uniform envelope density function, use a piecewise linear density function as your envelope instead
Rejection_sampling
Graph in engineering
equation will change for each linear section of the influence line. Therefore, the complete equation is a piecewise linear function with a separate influence-line
Influence_line
Curve simplification algorithm
Assuming the input is a one-based array: # source: https://karthaus.nl/rdp/ function DouglasPeucker(PointList[], epsilon) # Find the point with the maximum
Ramer–Douglas–Peucker algorithm
Ramer–Douglas–Peucker_algorithm
Mathematical function often applied to matrices
function f {\displaystyle f} . Similar results hold for finite element approximations, where the function space is replaced by (say) piecewise linear
Logarithmic_norm
Method of representing curves and surfaces in computer graphics
and derived the piecewise polynomial formula known as the spline curve or spline function. I. J. Schoenberg gave the spline function its name after its
Non-uniform_rational_B-spline
Standard RGB color space
implement the piecewise parametric curve encoding ("para") as specified by the IEC sRGB standard, and has to implement the sRGB transfer function using a one-dimensional
SRGB
test function". Journal of Global Optimization. 25 (2): 169–174. doi:10.1023/A:1021956306041. Bosse, Torsten F.; Bücker, H. Martin (2026). "A piecewise smooth
Griewank_function
Statistical method
Springer. Mumford, D., & Shah, J. (1989). Optimal approximations by piecewise smooth functions and associated variational problems. Communications on pure and
Step_detection
Model of signal reconstruction in digital-to-analog (DAC) converters
is the piecewise-constant signal depicted in Figure 2. The equation above for the output of the ZOH can also be modeled as the output of a linear time-invariant
Zero-order_hold
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PIECEWISE LINEAR-FUNCTION
PIECEWISE LINEAR-FUNCTION
PIECEWISE LINEAR-FUNCTION
PIECEWISE LINEAR-FUNCTION
PIECEWISE LINEAR-FUNCTION
PIECEWISE LINEAR-FUNCTION
PIECEWISE LINEAR-FUNCTION
PIECEWISE LINEAR-FUNCTION
PIECEWISE LINEAR-FUNCTION
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