null function
1Null function — Not to be confused with identity function or empty function. In computer science, a null function (or null operator) is subroutine that returns no data values and leaves the program state unchanged. When it is part of the instruction set of… …
2Null Object pattern — Null object redirects here. For the concept in category theory, see Initial object. In object oriented computer programming, a Null Object is an object with defined neutral ( null ) behavior. The Null Object design pattern describes the uses of… …
3Null (SQL) — The Greek lowercase omega (ω) character is used to represent Null in database theory. Null is a special marker used in Structured Query Language (SQL) to indicate that a data value does not exist in the database. Introduced by the creator of the… …
4Null character — For other uses, see Null symbol. The null character (also null terminator), abbreviated NUL, is a control character with the value zero.[1] [2] It is present in many character sets, including ISO/IEC 646 (or ASCII), the C0 control code, the… …
5Null (computer programming) — Null has several meanings in computer programming.;Null pointer or null reference * Null is a special pointer value (or other kind of object reference) used to signify that a pointer intentionally does not point to (or refer to) an object. Such a …
6Null-steering beamformer — Null Steering is a method of beam forming for narrow band signals where we want to have a simple way of compensating delays of receiving signals from a specific source at different elements of the antenna array. In general to make use of the… …
7Null set — In mathematics, a null set is a set that is negligible in some sense. For different applications, the meaning of negligible varies. In measure theory, any set of measure 0 is called a null set (or simply a measure zero set). More generally,… …
8Null cipher — A null cipher is an ancient form of encryption where the plaintext is mixed with a large amount of non cipher material. It would today be regarded as a simple form of steganography. Null ciphers can also be used to hide ciphertext, as part of a… …
9Null coalescing operator — The null coalescing operator (or Logical Defined Or Operator) is a binary operator that is part of the syntax for a basic conditional expression in several programming languages, including C#,[1] and Perl as of version 5.10.[2] In Scheme, boolean …
10Null hypothesis — For the periodical, see Null Hypothesis: The Journal of Unlikely Science. The practice of science involves formulating and testing hypotheses, assertions that are capable of being proven false using a test of observed data. The null hypothesis… …
