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A user-defined function (UDF) is a function provided by the user of a program or environment, in a context where the usual assumption is that functions are built into the program or environment. UDFs are usually written for the requirement of its creator.
From its first version Excel supported end-user programming of macros (automation of repetitive tasks) and user-defined functions (extension of Excel's built-in function library). In early versions of Excel, these programs were written in a macro language whose statements had formula syntax and resided in the cells of special-purpose macro ...
Use of user-defined function sq(x) in Microsoft Excel. Spreadsheets usually contain several supplied functions, such as arithmetic operations (for example, summations, averages, and so forth), trigonometric functions, statistical functions, and so forth. In addition there is often a provision for user-defined functions.
User Defined Functions (UDF), which are custom functions written to supplement Excel's set of built-in functions, supports the increased number of cells and columns. UDFs now can also be multithreaded.
XML Spreadsheet documents cannot store Visual Basic for Applications macros, auditing tracer arrows, charts and other graphic objects, custom views, drawing object layers, outlining, scenarios, shared workbook information and user-defined function categories. [1] In contrast, the newer Office Open XML formats support full document fidelity.
Visual Basic for Applications enables building user-defined functions (UDFs), automating processes and accessing Windows API and other low-level functionality through dynamic-link libraries (DLLs). It supersedes and expands on the abilities of earlier application-specific macro programming languages such as Word's WordBASIC. It can be used to ...
A built-in function, or builtin function, or intrinsic function, is a function for which the compiler generates code at compile time or provides in a way other than for other functions. [23] A built-in function does not need to be defined like other functions since it is built in to the programming language. [24]
This allows spreadsheet applications to add new functions, without interfering with current standard functions, future standard functions, or functions defined by other applications. As a result, different applications can add new functions without interfering with others; once a consensus arises about the new function, it can be standardized.