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Topics referred to by the same term
value Undefined variable, a variable that is accessed in code but has not been declared Undefined, something that lacks any definition Undefined citizenship
Undefined
An undefined variable in the source code of a computer program is a variable that is accessed in the code but has not been declared by that code. In some
Undefined_variable
Unpredictable result when running a program
A computer program exhibits undefined behavior (UB) when it contains, or is executing code for which its programming language specification does not mandate
Undefined_behavior
Programming language construct specifying an identifier's properties
(identifier's) meaning. Declarations are most commonly used for functions, variables, constants, and classes, but can also be used for other entities such
Declaration (computer programming)
Declaration_(computer_programming)
Named container for a particular type of data
simpler terms, a variable is a named container for a particular set of bits or type of data (like integer, float, string, etc...) or undefined. In some other
Variable (high-level programming language)
Variable_(high-level_programming_language)
User-definable variable associated with each running process in many operating systems
the special \nnn octal notation supported, see %$CLS%. While the variable is undefined by default under DOS Plus and DR-DOS, the Multiuser DOS default
Environment_variable
In computing, a condition where an expression does not have a correct value
usually treat undefined values explicitly when possible. For instance, Perl has undef operator which can "assign" such value to a variable. In other type
Undefined_value
Computer algorithm
Lovelace defines a hitherto undefined variable ( V 4 {\displaystyle V_{4}} ) by itself, thereby assuming that all undefined variables are automatically equal
Note_G
Computer program variable of undefined value
is undefined. The answer that it must be 10 assumes that it started at zero, which may or may not be true. Note that in the example, the variable i is
Uninitialized_variable
Set of rules defining correctly structured programs
to check whether a variable is undefined, because in versions before ECMAScript 5, it is legal for someone to write var undefined = "I'm defined now";
JavaScript_syntax
Language for controlling a computer
first line were omitted, the program would trigger an error on the undefined variable p during compilation. However, the program would still be syntactically
Programming_language
Class of web security vulnerabilities
and HTML elements in the Document Object Model (DOM). When an undefined JavaScript variable is declared in the same context as an HTML element with the
DOM_clobbering
Input where a function output does not matter
Incomplete opcode decoding Logic redundancy Undefined behaviour Undefined variable Uninitialized variable Four-valued logic Nine-valued logic Examples
Don't-care_term
Programming variable that persists for the lifetime of the program
values at the last exit, while the values of declared variables that are not marked with own is undefined. — Revised report on ALGOL 60, section "5. Declarations"
Static_variable
Average value of a random variable
generalization of the weighted average. The expected value of a random variable with a finite number of outcomes is a weighted average of all possible
Expected_value
Part of a computer program where a given name binding is valid
which is known as variable hoisting. Behavior of names in context that have undefined value differs: in Python use of undefined names yields a runtime
Scope_(computer_programming)
Electrode with a stable and accurate electrode potential
results are not trustworthy. Using aqueous electrodes introduces undefined, variable, and unmeasurable junction potentials to the cell in the form of
Reference_electrode
Concept in probability theory and statistics
expectation of a circularly symmetric complex random variable can only be either zero or undefined. Additionally, E [ Z Z ] = E [ e i ϕ Z e i ϕ Z ]
Complex_random_variable
required every time an undefined value is dereferenced. Perl autovivification allows a programmer to refer to a structured variable, and arbitrary sub-elements
Autovivification
Branch of mathematics
Calculus is the "mathematical backbone" for solving problems in which variable quantities change with time or another reference value. It has also been
Calculus
Distribution of variables which satisfies a stability property under linear combinations
\rightarrow 0} . The distributions have undefined variance for α < 2 {\displaystyle \alpha <2} , and undefined mean for α ≤ 1 {\displaystyle \alpha \leq
Stable_distribution
Real function with secant line between points above the graph itself
would be undefined (because the multiplications 0 ⋅ ∞ {\displaystyle 0\cdot \infty } and 0 ⋅ ( − ∞ ) {\displaystyle 0\cdot (-\infty )} are undefined). The
Convex_function
Probability distribution
"pathological" distribution since both its expected value and its variance are undefined (but see § Moments below). The Cauchy distribution does not have finite
Cauchy_distribution
Object whose state cannot be modified after it is created
programming, values held in program variables whose content never changes are known as constants to differentiate them from variables that could be altered during
Immutable_object
Local variable in computer programming
automatic variable has an undefined value until it is assigned a valid value of its type. The storage-class specifier auto can be added to these variable declarations
Automatic_variable
Mathematical expression with disputed status
Functions of a Complex Variable: Theory and Technique. p. 15. ISBN 0-89871-595-4. Since log(0) does not exist, 0z is undefined. For Re(z) > 0, we define
Zero_to_the_power_of_zero
Statistical relationship
correlation is a type of statistical relationship between two random variables or bivariate data. It usually refers to the extent to which a pair of
Correlation
a precondition is violated, the effect of the section of code becomes undefined and thus may or may not carry out its intended work. Security problems
Glossary_of_computer_science
Combinatorial optimization method for pseudo-Boolean functions
QPBO produces a solution where each variable assumes one of three possible values: true, false, and undefined, noted in the following as 1, 0, and ∅
Quadratic pseudo-Boolean optimization
Quadratic_pseudo-Boolean_optimization
Form of text that defines C code
Access to memory used for a block-declared variable after the block close (i.e. via a pointer) results in undefined behavior. The if conditional statement
C_syntax
Town in Bihar, India
Bihar. Falling Rain Genomics. Retrieved 10 March 2009. " Notice: Undefined variable: Post in /Opt/Lampp/Htdocs/Zhouyong/Icas.co.in/List.PHP on line 29"
Arwal
Object which stores memory addresses in a computer program
of automatic storage duration, pointer variables can sometimes point to unexpected locations, causing undefined behavior. To combat this, pointers are
Pointer (computer programming)
Pointer_(computer_programming)
Measure of the asymmetry of random variables
distribution. The skewness value can be positive, zero, negative, or undefined. For a unimodal distribution (a distribution with a single peak), negative
Skewness
C/C++ specifier referring to constant expression
preprocessor directives, as well as preventing certain cases of undefined behavior. A variable or a variable template may be declared constexpr if it is a definition
Constexpr
Expected value of a random variable given that certain conditions are known to occur
above, the expression is undefined if P ( Y = y ) = 0 {\displaystyle P(Y=y)=0} . Conditioning on a discrete random variable is the same as conditioning
Conditional_expectation
lambda term λa. Abstraction incorporates undefined variables by denoting λx.t(x) as the function assigning the variable a to the lambda term with value t(a)
Computable_topology
Point where the derivative of a function is zero or undefined (in certain cases)
function of several real variables, a critical point is a value in its domain where the gradient norm is equal to zero (or undefined). This sort of definition
Critical_point_(mathematics)
Implementation of the Fortran computer programming language
IBM 370 computer architecture. Most of the execution-time support (undefined variable checking, subscript evaluation, intrinsic functions) was written in
WATFIV
constant modification, DO LOOP modification, argument checking and undefined variable use. Program run-times are increased when checking is used. ClearWin+
Silverfrost_FTN95
Value that appears most often in a set of data
appears most often in a set of data values. If X is a discrete random variable, the mode is the value x at which the probability mass function P(X) takes
Mode_(statistics)
Set of rules defining correctly structured programs
Curly braces syntax: $f = "sqrt"; $x = 25; echo "a$xc\n"; // Warning: Undefined variable $xc echo "a{$x}c\n"; // prints a25c echo "a${x}c\n"; // also prints
PHP_syntax_and_semantics
Statistical model for a binary dependent variable
variable, coded by an indicator variable, where the two values are labeled "0" and "1", while the independent variables can each be a binary variable
Logistic_regression
execution regardless of undefined variables, whereas MUMPS is designed to throw an <UNDEF> error. When encountering an undefined variable, MIIS treats it as
MIIS_(programming_language)
Average uncertainty in variable's states
the entropy of a random variable quantifies the average level of uncertainty or information associated with the variable's potential states or possible
Entropy_(information_theory)
Formula in calculus
notation. If a variable z depends on the variable y, which itself depends on the variable x (that is, y and z are dependent variables), then z depends
Chain_rule
Technique for creating lexically scoped first class functions
accept that certain use cases will lead to undefined behaviour, due to dangling pointers to freed automatic variables, as in lambda expressions in C++11 or
Closure (computer programming)
Closure_(computer_programming)
Bridge in Plzeň Region, Czech Republic
"ENCYKLOPEDIE MOSTŮ -- STŘÍBRO". libri.cz. Retrieved 2019-09-28. "Notice: Undefined variable: pgTitle in /var/www/hrady/https/index.php on line 431". hrady.cz
Stříbro_bridge
Parameters that define a specific orbit
(long axis of the ellipse). This value is positive for elliptical orbits, undefined for parabolic trajectories, and negative for hyperbolic trajectories,
Orbital_elements
Landform where the floor of a crater is mostly covered by parallel ridges
icarus.2010.03.036. Retrieved 3 November 2021. "HiRISE | Notice: Undefined variable: Title in /Data/Www_hirise/Hiroc.LPL.arizona.edu/Images/PSP/Diafotizo
Concentric_crater_fill
Typographic symbol (underline)
(the early name of what is now called PL/I) leaves the character set undefined, but specifically mentions the break character, and gives RATE_OF_PAY
Underscore
Standardized digital audio interface
012: variable pitch (requires compatible receiver) 6–7 Undefined 4 0 Word length 20 bits Word length 24 bits 1–3 Sample length (0: undefined, 1–4: word
S/PDIF
High-level programming language
function-scoped variable named `x`, and implicitly assigns the // special value `undefined` to it. Variables without value are automatically // set to undefined. //
JavaScript
Programming language
Recursion Standard streams Static variables String handling Structs Type conversion Undefined behavior Unions Variables Constructs that behave differently
Outline of the C programming language
Outline_of_the_C_programming_language
Concept in probability theory
in the trivial case when either variable has zero variance (is a constant). In this case the correlation is undefined. In general, uncorrelatedness is
Uncorrelatedness (probability theory)
Uncorrelatedness_(probability_theory)
Script file for Microsoft computer operating systems
Equal Another difference in Windows 2000 or higher is that an empty variable (undefined) is not substituted. As described in previous examples, previous
Batch_file
Feature of some programming languages
null and undefined values. Julia has the nothing value (which is of type Nothing) and the Union{T, Nothing} type idiom. Perl scalar variables default to
Nullable_type
General-purpose programming language
explicitly points to no valid location. Dereferencing a null pointer value is undefined, often resulting in a segmentation fault. Null pointer values are useful
C_(programming_language)
Symbolic description of a mathematical object
value of the expression may be undefined. Thus an expression represents an operation over constants and free variables and whose output is the resulting
Expression_(mathematics)
Standard for financial instrument codes
attributes, that varies between groups. The letter X always means Not Appl./Undefined. Central Index Key – Identifier issued by the US SEC CUSIP – Code identifying
ISO_10962
General-purpose programming language
requirements, this results in undefined behavior. The Rust documentation includes a list of behaviors considered undefined, including accessing dangling
Rust_(programming_language)
Mathematical concept
coefficients. The degree of a term is the sum of the exponents of the variables that appear in it, and thus is a non-negative integer. For a univariate
Degree_of_a_polynomial
When the occurrence of one event does not affect the likelihood of another
not the preferred definition, as the conditional probabilities may be undefined if P ( A ) {\displaystyle \mathrm {P} (A)} or P ( B ) {\displaystyle \mathrm
Independence (probability theory)
Independence_(probability_theory)
Program function without side effects
threads executing f() concurrently do not result in a data race, which has undefined behavior in C and C++. The following C++ functions are impure as they
Pure_function
Angle of complex number about real axis
x<0} or undefined when x = 0 {\displaystyle x=0} . In Wolfram language, there's Arg[z]: Arg[x + y I] = { 0 if x = 0 and y = 0 , undefined if | x
Argument_(complex_analysis)
Keyword in the Java programming language
assigned once. Once a final variable has been assigned, it is intended to always contain the same value. If a final variable holds a reference to an object
Final_(Java)
Specially annotated symbol in an object file
(by default) a declared strong symbol without a definition triggers an undefined symbol link error. Weak symbols are not mentioned by the C or C++ language
Weak_symbol
Data having only values "true" or "false"
values are treated as true. In JavaScript, the empty string (""), null, undefined, NaN, +0, −0 and false are sometimes called falsy (of which the complement
Boolean_data_type
Control flow construct for executing code repeatedly
hold on termination of its loop, and indeed some hold that it becomes undefined. This permits a compiler to generate code that leaves any value in the
Loop_(statement)
Computer fault caused by access to restricted memory
dynamic memory allocation. Dereferencing a null pointer, which results in undefined behavior, will usually cause a segmentation fault. This is because a null
Segmentation_fault
Inverse of the average of the inverses of a set of numbers
= undefined lim α → 1 H = lim β → ∞ H = 0 lim β → 0 H = lim α → ∞ H = 1 {\displaystyle {\begin{aligned}\lim _{\alpha \to 0}H&={\text{ undefined }}\\\lim
Harmonic_mean
Of a function, an additional effect besides returning a value
system Monad (functional programming) Sequence point Side-channel attack Undefined behaviour Unspecified behaviour Frame problem Spuler, David A.; Sajeev
Side effect (computer science)
Side_effect_(computer_science)
Web programming language
JavaScript has the notion of null and undefined values, where null means a value is present but it's an empty value, and undefined means there isn't a value there
JS++
Computer science topic
multiplication by four. Shifts can result in implementation-defined behavior or undefined behavior, so care must be taken when using them. The result of shifting
Bitwise_operation
Measure of linear correlation
between two sets of data. It is the ratio between the covariance of two variables and the product of their standard deviations; thus, it is essentially
Pearson correlation coefficient
Pearson_correlation_coefficient
General-purpose programming language
language, are: no use of undefined values, variable shadowing, null pointers (unless marked as unsafe), or global variables (unless enabled via flag)
V_(programming_language)
Probability distribution with high skewness or kurtosis
exception of the normal distribution) have "undefined sigma" (more technically, the variance is undefined). As a consequence, when data arise from an
Fat-tailed_distribution
Number
results in 0, and consequently dividing by 0 is generally considered to be undefined in arithmetic. As a numerical digit, 0 plays a crucial role in decimal
0
Probability distribution
parameters, denoted by alpha (α) and beta (β), that appear as exponents of the variable and its complement to 1, respectively, and control the shape of the distribution
Beta_distribution
Algorithm for finding zeros of functions
Newton's method cannot be initialized at 0, since this would make x1 undefined. Geometrically, this is because the tangent line to f at 0 is horizontal
Newton's_method
Measure of how revenue growth translates into growth in operating income
which is an infinite (or undefined) percentage change; in terms of margins, its Operating Margin is zero, so its DOL is undefined. Similarly, for a very
Operating_leverage
Concept in computer programming
catastrophic undefined behavior if they share state. This situation can arise in parallel computing, causing race conditions, but undefined behavior can
Sequence_point
Probability distribution
a Dirac measure in a: it is the distribution of a deterministic random variable equal to a with probability 1. This is a special case of a discrete distribution;
Degenerate_distribution
Dialect of the BASIC programming language
VAR command. There were two primary forms, VAR=ZERO which made all undefined variables automatically get the value zero when accessed, which is the normal
SUPER_BASIC
Instantaneous rate of change (mathematics)
output with respect to its input. The derivative of a function of a single variable at a chosen input value, when it exists, is the slope of the tangent line
Derivative
Algebraic structure
polynomials in one or more indeterminates (traditionally also called variables) with coefficients in another ring, often a field. Often, the term "polynomial
Polynomial_ring
Method used for display options on video text terminals
that is not part of any valid sequence is encountered before the end is undefined. If the ESC is followed by a byte in the range 0x40 to 0x5F, the escape
ANSI_escape_code
C function to format and output text
between the format specifiers and count and type of values results in undefined behavior, and the program might crash or vulnerabilities may arise. The
Printf
direction to branch. If the values are not constant, or a variable in the condition is undefined, then both branch directions must be taken to remain conservative
Sparse conditional constant propagation
Sparse_conditional_constant_propagation
Mapping arbitrary data to fixed-size values
to fixed-size values, though there are some hash functions that support variable-length output. The values returned by a hash function are called hash values
Hash_function
Form of computer memory allocation
similar to how variable-length arrays are handled. Although there is no need to explicitly free the memory, there is a risk of undefined behavior due to
Stack-based_memory_allocation
Probability distribution in mathematics
zeta function (which is undefined for s = 1). The multiplicities of distinct prime factors of X are independent random variables. The Riemann zeta function
Zeta_distribution
Integral transform useful in probability theory, physics, and engineering
converts a function of a real variable (usually t {\displaystyle t} , in the time domain) to a function of a complex variable s {\displaystyle s} (in the
Laplace_transform
Instructional model of a computer
[BRZ ENDLOOP] depends on undefined behaviour, as COUNT-VALUE can be negative, after which the ACCUMULATOR value is undefined, resulting in BRZ either
Little_Man_Computer
Species of succulent
gasteria, is a small and variable succulent plant native to the Western Cape Province, South Africa. This is a highly variable species. Typically it has
Gasteria_carinata
Computer memory management methodology
POSIX or the C standard, its behavior in case of a stack overflow is undefined. A safer version of alloca called _malloca, which reports errors, exists
Memory_management
Mathematical techniques for summing divergent infinite series
study of divergent infinite series, for which conventional summation is undefined. Since there are no properties of an entire sum, the Ramanujan summation
Ramanujan_summation
Numerical analysis programming language
to learn how you can contribute missing functionality. error: 'guide' undefined near line 1 column 1 Octave comes with an official graphical user interface
GNU_Octave
Quantity in information theory
derived from the probability of a particular event occurring from a random variable. It can be thought of as an alternative way of expressing probability,
Information_content
C programming language standard draft planned for release in 2029
WG14 meeting: N3272 - "strftime broken-down structure usage (Option 1 - "Undefined Behavior)". N3286 - "Floating-point exception for Macro Replacements"
C29_(C_standard_revision)
Type of mathematical expression
is a mathematical expression consisting of indeterminates (also called variables) and coefficients, that involves only the operations of addition, subtraction
Polynomial
UNDEFINED VARIABLE
UNDEFINED VARIABLE
Girl/Female
Muslim
Writer, Stated, Well-defined
Girl/Female
Arabic, Muslim
Writer; Stated; Well-defined
Girl/Female
Tamil
Beauty redefined
Girl/Female
Biblical
According to variable songs or tunes.
Boy/Male
Anglo, British, English
Variable
Girl/Female
Hindu, Indian, Marathi, Tamil
Beauty Redefined
Girl/Female
Afghan, Arabic, Australian, Iranian, Muslim, Parsi
Star; Venus; The Planet Venus; Immaculate; Undefiled; Planet Venus
Boy/Male
Hindu
Well defined body
Boy/Male
Anglo, Australian, British, English, French, Swedish
Variable; Brave with the Spear; Spear Rule
Surname or Lastname
English
English : from a medieval male personal name (from Latin Hilarius, a derivative of hilaris ‘cheerful’, ‘glad’, from Greek hilaros ‘propitious’, ‘joyful’). The Latin name was chosen by many early Christians to express their joy and hope of salvation, and was borne by several saints, including a 4th-century bishop of Poitiers noted for his vigorous resistance to the Arian heresy, and a 5th-century bishop of Arles. Largely due to veneration of the first of these, the name became popular in France in the forms Hilari and Hilaire, and was brought to England by the Norman conquerors.English : from the much rarer female personal name Eulalie (from Latin Eulalia, from Greek eulalos ‘eloquent’, literally well-speaking, chosen by early Christians as a reference to the gift of tongues), likewise introduced into England by the Normans. A St. Eulalia was crucified at Barcelona in the reign of the Emperor Diocletian and became the patron of that city. In England the name underwent dissimilation of the sequence -l-l- to -l-r- and the unfamiliar initial vowel was also mutilated, so that eventually the name was considered as no more than a feminine form of Hilary (of which the initial aspirate was in any case variable).
Surname or Lastname
English (of Norman origin)
English (of Norman origin) : habitational name from Saint-Hilaire-du-Harcouët in La Manche, which gets its name from the dedication of its church to St. Hilary, or alternatively from either of the places, in La Manche and Somme, called Saint-Lô. Both of the latter are named from a 6th-century St. Lauto, bishop of Coutances; his name is of variable form in the sources and uncertain etymology.North German : habitational name for someone from Sandel.Jewish (eastern Ashkenazic) : occupational name for a cobbler or shoemaker, Yiddish sandler (from Hebrew sandelar, from Late Latin sandalarius, an agent derivative of sandalium ‘shoe’).
Biblical
according to variable songs or tunes,
Boy/Male
Tamil
Well defined body
Surname or Lastname
English
English : topographic name for someone living on (and farming) a hide of land, Old English hī(gi)d. This was a variable measure of land, differing from place to place and time to time, and seems from the etymology to have been originally fixed as the amount necessary to support one (extended) family (Old English hīgan, hīwan ‘household’). In some cases the surname is habitational, from any of the many minor places named with this word, as for example Hyde in Greater Manchester, Bedfordshire, and Hampshire.English : variant of Ide, with inorganic initial H-. Compare Herrick.Jewish (American) : Americanized spelling of Haid.
UNDEFINED VARIABLE
UNDEFINED VARIABLE
Female
Hebrew
Variant spelling of Hebrew Chana, CHANNA means "favor; grace." In the bible, this is the name of the mother of Samuel and wife to Elkanah.
Male
Scottish
Variant spelling of Scottish Somerled, SUMMERLAD means "summer traveler."
Girl/Female
German, Hebrew
Hazelnut; Life; Form of Eve
Girl/Female
Indian, Punjabi, Sikh
Support of the Goddess
Surname or Lastname
English
English : variant spelling of Dyson.
Female
Greek
Variant spelling of Greek Elene, possibly ELENI means "torch."
Girl/Female
Tamil
Sulekhya | ஸà¯à®²à¯‡à®•à¯à®¯à®¾
Boy/Male
Tamil
Ramanuj | ராமாநà¯à®œ
Born after Rama i.e. Lakshman (Younger brother of Rama)
Male
Romanian
Romanian form of Greek Nikolaos, NICOLÆ means "victor of the people." In use by the Romani.
Boy/Male
Muslim
Teacher
UNDEFINED VARIABLE
UNDEFINED VARIABLE
UNDEFINED VARIABLE
UNDEFINED VARIABLE
UNDEFINED VARIABLE
a.
Without stain or blemish; spotless; undefiled; clear; pure.
n.
Unlimited; not bounded or restricted; undefined.
a.
Undefiled.
imp. & p. p.
of Define
a.
Pure; undefiled.
n.
Undefined quantity; extent; degree.
a.
Pure; undefiled; unmixed; fresh; new; as, virgin soil; virgin gold.
a.
Unviolated; uninjured; undefiled; uncorrupted.
a.
Gross; low; unrefined.
n.
Unrefined or raw sugar.
n.
A thing defined or determined.
a.
Not blemished; undefiled; pure.
n.
Undecided character of a disease.
a.
Not accomplished or performed; unfinished; also, deficient in accomplishment; unrefined.
adv.
At a time undefined; once in a while; now and then; sometimes.
adv.
In an irresolute, undecided, or hesitating manner.
n.
An undecided, inquiring state of mind; doubt; uncertainty.
a.
Undefined; indefinite; not bounded by proper exceptions; as, unlimited terms.
v. t.
To make indefinite; to obliterate or confuse the definition or limitations of.
n.
Any portion of territory of undefined extent; a region; a country; a tract.