programming), undefined value is a condition where an expression does not have a correct value, although it is syntactically correct. An undefined value must not...

correct value Undefined variable Undefined, a function or variable lacking a declaration Undefined, a variable lacking initialization Undefined, an unavailable...

In mathematics, the term undefined is often used to refer to an expression which is not assigned an interpretation or a value (such as an indeterminate...

In computer programming, undefined behavior (UB) is the result of executing a program whose behavior is prescribed to be unpredictable, in the language...

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()...

which represents absurdum under the Curry–Howard correspondence The "undefined value" in quantum physics interpretations that reject counterfactual definiteness...

returned when the return statement is omitted, while in JavaScript the value undefined is returned. In Windows PowerShell all evaluated expressions which...

automatic creation of new arrays and hashes as required every time an undefined value is dereferenced. Perl autovivification allows a programmer to refer...

\\{\text{undefined}}&{\text{if }}x=0{\text{ and }}y=0.\end{cases}}} Notes: This produces results in the range (−π, π]. As mentioned above, the principal value...

X is undefined. Similarly, the Cauchy distribution, as discussed above, has undefined expectation. The following table gives the expected values of some...

do not designate any value (for instance when they involve division by 0); such expressions are said to have an undefined value, but they are well-formed...

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:...

means that values cannot be accessed before they are declared; forward reference is not possible. With var a variable's value is undefined until it is...

principal value, named after Augustin-Louis Cauchy, is a method for assigning values to certain improper integrals which would otherwise be undefined. In this...

.. undefined <altitude> MAY assume that the URI refers to the respective location on Earth's physical surface." However, "... an <altitude> value of 0...

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...

boilerplate code needed for common operations (such as dealing with undefined values or fallible functions, or encapsulating bookkeeping code). Functional...

Julian; Nethercote, Nicholas (10 April 2005). "Using Valgrind to detect undefined value errors with bit-precision". Proceedings of the USENIX Annual Technical...

opcode decoding Logic redundancy Undefined behaviour Undefined variable Uninitialized variable Four-valued logic Nine-valued logic Examples of encoding schemes...

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:...

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...

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...

any arbitrary type, including sets and tuples themselves, except the undefined value om (sometimes capitalized: OM). Maps are provided as sets of pairs...

Comma-separated values (CSV) is a text file format that uses commas to separate values, and newlines to separate records. A CSV file stores tabular data...

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)...

context that have undefined value differs: in Python use of undefined names yields a runtime error, while in JavaScript undefined names declared with...

32 bits of the destination undefined.[citation needed] Note that Intel documents that the destination register has an undefined value in this case, but in practice...

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...

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...

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);...