user-defined function


Also found in: Wikipedia.

user-defined function

[¦yü·zər di′fīnd ′fəŋk·shən]
(computer science)
A subroutine written by the programmer to calculate and return the value of a mathematical function.
References in periodicals archive ?
This month's download database (see http:// sfmagazine.com) contains a module called mod_ExcelSetting with a user-defined function (UDF) that uses Excel capabilities to read international settings for Windows.
The controller's 280 KB memory capacity supports modular programming and the use of user-defined function blocks to help reduce design time.
Sybase IQ is the most established of the column-based databases that have become trendy for BI and analytics applications.<p>"By incorporating MapReduce in a user-defined function (UDF) approach, we'll be able to break down the complexity of a problem [and] push processing closer to where the data resides while keeping the friendly SQL-like exterior," Khan said.<p>Startups Aster Data Inc.
A database user-defined function is a routine that accepts parameters, performs the calculation defined by algorithms, and returns a result.
The two user-defined function keys allow quick access to the most important features.
With this implementation the whole query processing algorithm is encapsulated into the user-defined function getSimilarImages(...).
Now in its second generation, this mobile device runs Vista and comes with an integrated split-QWERTY keypad, mouse, touch screen and stylus, user-defined function keys, and a high resolution 1.3-megapixel camera that supports video recording and still pictures.
Software features include Windows NT and VxWorks operating systems, VMIC CompactPCI I/O driver software, IEC 61131-3-compliant programming languages, and user-defined function blocks.
The package DCUTRI [Berntsen and Espelid 1992] fails to compute an accurate error estimate in the case where the quadrature rules integrate the user-defined function exactly.
Currently, adding a user-defined function is possible but a bit inconvenient: The code implementing any user-defined function must be linked with the rest of the Starburst system.
There's a module with a user-defined function that enables the PMT function to be used by a query.
UDFs (user-defined function) are a highly important feature to those who program with dBASE IV.