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In computing, a condition where an expression does not have a correct value
programming), undefined value is a condition where an expression in a programming language does not have a semantically correct value in the language
Undefined_value
Topics referred to by the same term
Indeterminate form, in calculus Undefined behavior, computer code whose behavior is not specified under certain conditions Undefined value, a condition where an
Undefined
Expression which is not assigned an interpretation
In mathematics, the term undefined refers to a value, function, or other expression that cannot be assigned a meaning within a specific formal system
Undefined_(mathematics)
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
Expression in computer science which cannot be evaluated further
depending on the assembler and computer architecture. Undefined value Value (mathematics) Value-level programming Mitchell 1996, p. 9. Aho, Alfred V.;
Value_(computer_science)
Set of rules defining correctly structured programs
undefined value is considered a false value. Note: undefined is considered a genuine primitive type. Unless explicitly converted, the undefined value
JavaScript_syntax
Average value of a random variable
X} is undefined. Similarly, the Cauchy distribution, as discussed above, has undefined expectation. In the case of a non-negative integer-valued random
Expected_value
Method for assigning values to integrals
principal value, named after Augustin-Louis Cauchy, is a method for assigning values to certain improper integrals which would otherwise be undefined. In this
Cauchy_principal_value
Symbol used in mathematics and logic
which represents absurdum under the Curry–Howard correspondence The "undefined value" in quantum physics interpretations that reject counterfactual definiteness
Up_tack
Web programming language
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 at all. JS++
JS++
Web browser bookmark containing JavaScript code
evaluates to the undefined type in JS. I added the void operator to JS before Netscape 2 shipped to make it easy to discard any non-undefined value in a javascript:
Bookmarklet
Arctangent function with two arguments
coordinates. Systems supporting symbolic mathematics normally return an undefined value for atan2(0, 0) or otherwise signal that an abnormal condition has
Atan2
Mathematical expression with disputed status
Other authors leave 00 undefined because 00 is an indeterminate form. There do not seem to be any authors assigning 00 a specific value other than 1. The IEEE
Zero_to_the_power_of_zero
Statement which ends execution of a function and resumes in the main code
returned when the return statement is omitted, while in JavaScript the value undefined is returned. In Windows PowerShell all evaluated expressions which
Return_statement
Estimated potential loss for an investment under a given set of conditions
Value at risk (VaR) is a measure of the risk of loss of investment/capital. It estimates how much a set of investments might lose (with a given probability)
Value_at_risk
Input where a function output does not matter
opcode decoding Logic redundancy Undefined behaviour Undefined variable Uninitialized variable Four-valued logic Nine-valued logic Examples of encoding schemes
Don't-care_term
automatic creation of new arrays and hashes as required every time an undefined value is dereferenced. Perl autovivification allows a programmer to refer
Autovivification
Computer program variable of undefined value
= 0; i < 10; i++) { k = k + 1; } printf("%d", k); } The final value of k is undefined. The answer that it must be 10 assumes that it started at zero
Uninitialized_variable
Object which stores memory addresses in a computer program
87: If an invalid value has been assigned to the pointer, the behavior of the unary * operator is undefined... Among the invalid values for dereferencing
Pointer (computer programming)
Pointer_(computer_programming)
Processor flag indicating whether signed arithmetic overflow has occurred
leave it unchanged, and some set it to an undefined value. Shifts and multiplies do permit a well-defined value, but it is not consistently implemented
Overflow_flag
Internet resource address stored for later retrieval
evaluates to the undefined type in JS. I added the void operator to JS before Netscape 2 shipped to make it easy to discard any non-undefined value in a javascript:
Bookmark_(World_Wide_Web)
System of geographic location identifiers
.. undefined <altitude> MAY assume that the URI refers to the respective location on Earth's physical surface." However, "... an <altitude> value of 0
Geo_URI_scheme
Value indicating the relation of a proposition to truth
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
Truth_value
Part of a computer program where a given name binding is valid
context that have undefined value differs: in Python use of undefined names yields a runtime error, while in JavaScript undefined names declared with
Scope_(computer_programming)
Statistical model for a binary dependent variable
categorical predictors because the natural logarithm of zero is an undefined value so that the final solution to the model cannot be reached. To remedy
Logistic_regression
Class of mathematical expression
{0}{0}}} is also left undefined. Calculus studies the behavior of functions in the limit as their input tends to some value. When a real function can
Division_by_zero
Measure of the asymmetry of random variables
characteristics of a distribution. The skewness value can be positive, zero, negative, or undefined. For a unimodal distribution (a distribution with
Skewness
Method for partial-fraction expansion
in the denominator. Each root for the variable is the value which would give an undefined value to the expression since we do not divide by zero. General
Heaviside_cover-up_method
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
Integral transform and linear operator
challenges to practical implementation in a convolution (in addition to its undefined value at 0): Its duration is infinite (technically infinite support). Finite-length
Hilbert_transform
Feature of some programming languages
languages with null include: JavaScript has a null and undefined values. Julia has the nothing value (which is of type Nothing) and the Union{T, Nothing}
Nullable_type
Marker used in SQL databases to indicate a value does not exist
data domain, it is not considered a "value", but rather a marker (or placeholder) indicating the undefined value. Because of this, comparisons with Null
Null_(SQL)
Statistic measuring inter-rater agreement for categorical items
because Kappa is a ratio. It is possible for Kappa's ratio to return an undefined value due to zero in the denominator. Furthermore, a ratio does not reveal
Cohen's_kappa
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
Point-based valuation system for chess pieces
partially based on the earlier work of Pietro Carrera. The value of the king is undefined as it cannot be captured or traded during the course of the
Chess_piece_relative_value
General-purpose programming language
string values are immutable, so elements cannot be mutated. Other protections, which are the default for the language, are: no use of undefined values, variable
V_(programming_language)
List of x86 microprocessor instructions
Indefinite value will also be used if the top-of-stack value is Empty, NaN or ±∞. The result of executing the FBLD instruction on non-BCD data is undefined. For
List_of_x86_instructions
Computer science topic
greater than or equal to the word's size is undefined behavior in C and C++. Right-shifting a negative value is implementation-defined and not recommended
Bitwise_operation
Family of probability distributions
via metrics such as value at risk. However, the resulting shape parameters have been found to lie in the range leading to undefined means and variances
Generalized extreme value distribution
Generalized_extreme_value_distribution
Propositional calculus in which there are more than two truth values
K_{3}^{S}} ) and Priest's "logic of paradox" add a third undefined or indeterminate truth value I. The truth functions for negation (¬), conjunction (∧)
Many-valued_logic
Point where the derivative of a function is zero or undefined (in certain cases)
function derivative is zero (or undefined, as specified below). The value of the function at a critical point is a critical value. More specifically, when dealing
Critical_point_(mathematics)
Universal subtype in logic and computer science
all possible values in a system. If the bottom type is inhabited, its term(s) typically correspond to error conditions such as undefined behavior, infinite
Bottom_type
Value for unrepresentable data
for Not a Number, is a particular value of a numeric data type (often a floating-point number) which is undefined as a number, such as the result of
NaN
Value approached by a mathematical object
mathematics, a limit is the value that a function (or sequence) approaches as the argument (or index) approaches some value. Limits of functions are essential
Limit_(mathematics)
Programming tool for profiling, memory debugging and memory leak detection
Julian; Nethercote, Nicholas (10 April 2005). "Using Valgrind to detect undefined value errors with bit-precision". Proceedings of the USENIX Annual Technical
Valgrind
Function or value which does not change
generally written as 'c', and represents a constant with a fixed but undefined value. If f is the constant function such that f ( x ) = 72 {\displaystyle
Constant_(mathematics)
Programming language evaluation rules
the function strict, i.e. the function's result is undefined if any of the arguments are undefined, so applicative order evaluation is more commonly called
Evaluation_strategy
Numeric quantity representing the center of a collection of numbers
distributions the mean is infinite (+∞ or −∞), while for others the mean is undefined. The generalized mean, also known as the power mean or Hölder mean, abstracts
Mean
Local variable in computer programming
default. An uninitialized automatic variable has an undefined value until it is assigned a valid value of its type. The storage-class specifier auto can
Automatic_variable
Dose dependant harmfulness of substances
limits for each category. Note: The undefined values are expected to be roughly equivalent to the category 5 values for oral and dermal administration
Toxicity
respond to undefined variables. Each code snippet is followed by an error message (if any). (setf y x) *** - EVAL: variable X has no value int main()
Undefined_variable
Area of geometry, about angles and lengths
chords, while mathematicians in India created the earliest-known tables of values for trigonometric ratios (also called trigonometric functions) such as sine
Trigonometry
Design pattern in functional programming to build generic types
null object pattern or checks to test for invalid values at each operation to handle undefined values. This causes bugs and makes it harder to build robust
Monad (functional programming)
Monad_(functional_programming)
Measure of forecasting quality
containing a large amount of zeros) because it never gives infinite or undefined values except in the irrelevant case where all historical data are equal.
Mean_absolute_scaled_error
Programming language
any arbitrary type, including sets and tuples themselves, except the undefined value om (sometimes capitalized: OM). Maps are provided as sets of pairs
SETL
Alternative representations of the RGB color model
the intermediate value X for the second largest component of this color): ( R 1 , G 1 , B 1 ) = { ( 0 , 0 , 0 ) if H is undefined ( C , X , 0 ) if
HSL_and_HSV
Mathematical term
function) has zero slope: m = 0 {\displaystyle m=0} . A "vertical" line has undefined or infinite slope (see below). If two points of a road have altitudes
Slope
Angle of complex number about real axis
absolute value) of z, denoted |z|: r = x 2 + y 2 . {\displaystyle r={\sqrt {x^{2}+y^{2}}}.} The argument of zero is usually left undefined. The names
Argument_(complex_analysis)
Programming language
the undefined value, or bottom. Sequences are bottom-preserving: 〈x1,...,⊥,...,xn〉 = ⊥ FP programs are functions f that each map a single value x into
FP_(programming_language)
C function to format and output text
Extra value arguments are ignored, but if the format string has more format specifiers than value arguments passed, the behavior is undefined. For some
Printf
Trigonometric values in terms of square roots and fractions
these entries are undefined, whereas if the codomain is taken to be the projectively extended real numbers, these entries take the value ∞ {\displaystyle
Exact_trigonometric_values
Statistical test of variance
categorical predictors is because the natural logarithm of zero is an undefined value, so final solutions to the model cannot be reached. To remedy this
Omnibus_test
Programming language
existence of something: SKIP, "~" or "?"C – an undefined value always syntactically valid, EMPTY – the only value admissible to VOID, needed for selecting VOID
ALGOL_68
Study of mathematical algorithms for optimization problems
the objective function is unbounded, so the answer is "infinity" or "undefined". Consider the following notation: a r g m i n x ∈ ( − ∞ , − 1 ] x 2 +
Mathematical_optimization
Instructional model of a computer
the default value 0 is stored in the memory address. In the example above, [BRZ ENDLOOP] depends on undefined behaviour, as COUNT-VALUE can be negative
Little_Man_Computer
Unary operators that add or subtract one from their operand, respectively
such an operand more than once within the same expression can produce undefined results. For example, in expressions such as x - ++x, it is not clear
Increment and decrement operators
Increment_and_decrement_operators
Value indicating that a referenced dataset is invalid or doesn't exist
value (if any) is nil or 0, depending on the type. In Rust, dereferencing a null pointer (std::ptr::null()) in an unsafe block results in undefined behaviour
Null_pointer
Instruction for x86 processors
1 if the number of ones in that byte is even, 0 otherwise. The value of AF is undefined. ; Conditional Jump test cl,cl ; set ZF to 1 if cl == 0 jz 0x8004f430
TEST_(x86_instruction)
File format for executables, object code, shared libraries, and core dumps
sections 1 and up. Section value zero is used in the symbol table for symbols that are not defined in any section (undefined). Such as a method, or data
Mach-O
input value is undefined (regardless if it was implicitly undefined via the argument's absence at the call site or an explicitly passed undefined value);
Default_argument
File format standard for electronic business cards
representing vCard instances in JSON, using arrays of sequence-dependent tag–value pairs. jCard has been incorporated into several other protocols, including
VCard
Type that allows only one value
value is null) and Undefined (its only value is undefined) are built-in unit types. in Kotlin, Unit is a singleton with only one value: the Unit object
Unit_type
Object whose state cannot be modified after it is created
const(S) for const(T) values, and immutable(S) for immutable(T) values. Casting immutable values to mutable inflicts undefined behavior upon change, even
Immutable_object
Concept in quantum mechanics
have the pair (r0,⊥) where ⊥ (called "up tack" or "eet") denotes an undefined value. To use a macroscopic analogy, an interpretation which rejects counterfactual
Counterfactual_definiteness
Combinatorial optimization method for pseudo-Boolean functions
minimum exactly, equivalent to graph cut, and all variables have a non-undefined value; if submodularity is not satisfied, the result will be a partial solution
Quadratic pseudo-Boolean optimization
Quadratic_pseudo-Boolean_optimization
Generalization of the real numbers
binary relation < to be lexicographic order (with the convention that "undefined values" are greater than −1 and less than 1). So x < y if one of the following
Surreal_number
Mapping arbitrary data to fixed-size values
data values (such as the country code "xx" or the ZIP code 00000) may be left undefined in the table or mapped to some appropriate "null" value. If the
Hash_function
Esoteric, minimalist programming language
can move left or right. Moving left from the first cell (index 0) is undefined. The language provides eight commands that modify the tape, move the pointer
Brainfuck
Operations transforming individual bits of integral data types
shift operand value which is either a negative number or is greater than or equal to the total number of bits in this value results in undefined behavior.
Bitwise_operations_in_C
One of several equivalent definitions of a computable function
arguments either both functions are defined and their values are equal or both functions are undefined. Examples not involving the minimization operator can
General_recursive_function
Programming language construct
suffice to determine the value of the expression: when the first argument of the AND function evaluates to false, the overall value must be false; and when
Short-circuit_evaluation
superlatives. The variation is because the term production car is otherwise undefined. Because of the inconsistencies with the various definitions of production
List of production car speed records
List_of_production_car_speed_records
Expected value of a random variable given that certain conditions are known to occur
conditional expectation, conditional expected value, or conditional mean of a random variable is its expected value evaluated with respect to the conditional
Conditional_expectation
Probability distribution
of a "pathological" distribution since both its expected value and its variance are undefined (but see § Moments below). The Cauchy distribution does not
Cauchy_distribution
Named container for a particular type of data
or undefined. In some other languages such as BASIC, Python, or Ruby — a variable is more accurately described as a name associated with a value, with
Variable (high-level programming language)
Variable_(high-level_programming_language)
Algorithm for finding zeros of functions
know that our solution lies between 0 and 1. A starting value of 0 will lead to an undefined result which illustrates the importance of using a starting
Newton's_method
Ratio of magnetic moment and angular momentum
the spin and magnetic moment may be zero, in which case the g-factor is undefined). Conventionally, the associated g-factors are defined using the nuclear
G-factor_(physics)
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
Declaration of an identifier in computer programming
compilation time these are initialized by language specific rules (to undefined values, 0, NULL pointers, ...). Variables that are defined in other source/object
Forward_declaration
Number which when multiplied by x equals 1
the real numbers, zero does not have a reciprocal (division by zero is undefined) because no real number multiplied by 0 produces 1 (the product of any
Multiplicative_inverse
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 symbol of equality
two expressions that have the same value, or for which one studies the conditions under which they have the same value. In Unicode and ASCII it has the
Equals_sign
the three-valued logic of Kleene, which do not fully determine the truth value of compound statements if any component statement is undefined. weak mathematical
Glossary_of_logic
Problem in computer science
shown at the bottom; U indicates that the function g is undefined for a particular input value. The proof proceeds by directly establishing that no total
Halting_problem
General-purpose programming language
event handlers. A null pointer value explicitly points to no valid location. Dereferencing a null pointer value is undefined, often resulting in a segmentation
C_(programming_language)
Slavery as a means to repay debt
the undefined or excessive debt repayment. The services required to repay the debt may be undefined, and the services' duration may be undefined, thus
Debt_bondage
Mathematical function that outputs real values
for any f ∈ Lp(X) and x ∈ X which is not an atom, the value f(x) is undefined. Though, real-valued Lp spaces still have some of the structure described
Real-valued_function
Vowel sound represented by ⟨ɜ⟩ in IPA
⟨ə̞͑⟩ to explicitly denote the lack of rounding (the canonical value of IPA ⟨ə⟩ is undefined for rounding). Its vowel height is open-mid, also known as low-mid
Open-mid central unrounded vowel
Open-mid_central_unrounded_vowel
Instantaneous rate of change (mathematics)
whose value at a {\displaystyle a} equals f ′ ( a ) {\displaystyle f'(a)} whenever f ′ ( a ) {\displaystyle f'(a)} is defined and elsewhere is undefined is
Derivative
Root-finding algorithm
reinterpreting a floating point value as an integer by casting then dereferencing the pointer to it can cause undefined behavior in case the sizes of integer
Fast_inverse_square_root
UNDEFINED VALUE
UNDEFINED VALUE
Surname or Lastname
English
English : habitational name from any of various minor places called Worthy, from Old English worðig, a derivative of worð ‘enclosure’.English : nickname for a respected member of the community, from Middle English worthy ‘valuable’ (a derivative of worth ‘value’, ‘merit’, Old English weorð).
Surname or Lastname
English (Bristol, Gwent)
English (Bristol, Gwent) : from Middle English tresor ‘treasure’, ‘wealth’, ‘riches’ (Old French trésor, from Latin thesaurus ‘hoard’), hence a metonymic occupational name for a treasurer or person in charge of financial administration, or an affectionate nickname for a loved or valued person.
Surname or Lastname
English (Lancashire)
English (Lancashire) : habitational name from a place in the parish of Wigan (now in Greater Manchester), so called from Old English mearc ‘boundary’ + lanu ‘lane’.English (Lancashire) : topographic name for someone who lived by a stretch of border or boundary land (see Mark) or a status name for someone who held land with an annual value of one mark.
Girl/Female
Hindu, Indian, Marathi, Tamil
Beauty Redefined
Boy/Male
Indian
Value, Price
Boy/Male
Tamil
Ruby, Valued, Honoured, Gem
Boy/Male
Tamil
Sanskar | ஸஂஸà¯à®•à®¾à®°
Good ethics and moral values
Sanskar | ஸஂஸà¯à®•à®¾à®°
Boy/Male
Tamil
Well defined body
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
Hindu
Honored by many, Universally respected and valued
Girl/Female
Arabic, Muslim
Writer; Stated; Well-defined
Boy/Male
Biblical Welsh
Honor of God; valued of God.
Girl/Female
Muslim
Writer, Stated, Well-defined
Surname or Lastname
English (also present in Ireland)
English (also present in Ireland) : from Middle English peni, peny ‘penny’, applied as a nickname, possibly for a person of some substance or for a tenant who paid a rent of one penny. This was the common Germanic unit of value when money was still an unusual phenomenon. It was the only unit of coinage in England until the early 14th century, when the groat and the gold noble were introduced, and was a silver coin of considerable value. There is some evidence that the word was used in Old English times as a byname.
Boy/Male
Muslim
Value, Price
Surname or Lastname
English, Scottish, Dutch, and German
English, Scottish, Dutch, and German : metonymic occupational name for a herring fisher or for a seller of the fish, Middle English hering, Dutch haring, Middle High German hærinc. In some cases it may have been a nickname in the sense of a trifle, something of little value, a meaning which is found in medieval phrases and proverbial expressions such as ‘to like neither herring nor barrel’, i.e. not to like something at all.German : habitational name from Herringen in Westphalia.Dutch : from a personal name, a derivative of a Germanic compound name with the first element hari, heri ‘army’.Jewish (Ashkenazic) : variant spelling of Hering.
Boy/Male
Hindu
Ruby, Valued, Honoured, Gem
Boy/Male
Tamil
Priyangu | பà¯à®°à®¿à®¯à®‚கà¯
It means one who is loving and charming. its actually a flower which has medicinal values
Priyangu | பà¯à®°à®¿à®¯à®‚கà¯
Girl/Female
Tamil
Beauty redefined
UNDEFINED VALUE
UNDEFINED VALUE
Boy/Male
Welsh
Legendary son of Kelyddon.
Girl/Female
Australian, French, Hebrew, Latin
Fruitful Orchard; As Mount Carmel in Palestine
Girl/Female
Indian
Male
English
Man of Flatlands
Girl/Female
Greek French
Immortal. 5th-century British military leader Ambrosius Aurelianus was probably a prototype for...
Girl/Female
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Sindhi, Telugu
Walking in Three Paths
Boy/Male
Hindu
Chief
Girl/Female
Tamil
Gold
Girl/Female
German
Noble; Kind
Surname or Lastname
English
English : variant of Wells.
UNDEFINED VALUE
UNDEFINED VALUE
UNDEFINED VALUE
UNDEFINED VALUE
UNDEFINED VALUE
n.
A thing defined or determined.
a.
Undefiled.
n.
Undecided character of a disease.
adv.
At a time undefined; once in a while; now and then; sometimes.
a.
Unviolated; uninjured; undefiled; uncorrupted.
a.
Pure; undefiled.
a.
Undefined; indefinite; not bounded by proper exceptions; as, unlimited terms.
a.
Gross; low; unrefined.
a.
Not accomplished or performed; unfinished; also, deficient in accomplishment; unrefined.
a.
Not blemished; undefiled; pure.
n.
An undecided, inquiring state of mind; doubt; uncertainty.
n.
Unlimited; not bounded or restricted; undefined.
n.
Undefined quantity; extent; degree.
n.
Any portion of territory of undefined extent; a region; a country; a tract.
adv.
In an irresolute, undecided, or hesitating manner.
imp. & p. p.
of Define
n.
Unrefined or raw sugar.
v. t.
To make indefinite; to obliterate or confuse the definition or limitations of.
a.
Without stain or blemish; spotless; undefiled; clear; pure.
a.
Pure; undefiled; unmixed; fresh; new; as, virgin soil; virgin gold.