Function

A function is a named location which provides for a series of instructions to be executed in sequence. A function in APL serves the purpose of both a function or procedure in other high-level languages such as C or Pascal. Functions are of three kinds: niladic (has no arguments); monadic (has one argument specified to the right of the function name); or dyadic (has an argument to the right and to the left of the function name.

Like variables, functions in APL in general, and NARS2000 in particular, come in two flavors: user functions and system functions.

User Functions

User functions come into existence when the creator of a workspace creates the function. Th rules for naming a user function are as follows:

-- Do later --

System functions

System functions are created by NARS2000 when the program starts. They begin with the quad symbol ⎕, and one or more letters. The current list of system functions is as follows:

Niladic System Functions
⎕A	The alphabet from A to Z, also Á to Ź,  to Ẑ, À to À, Ä to Z and à to Z, all in lowercase, too using the variations ⎕a ⎕A ⎕á ⎕Á ⎕à ⎕À ⎕â ⎕ ⎕ä ⎕Ä ⎕ã ⎕Ã
⎕AV	Atomic Vector
⎕CS	Collating sequence
⎕EM	Event Message
⎕ET	Event Type
⎕LC	Line Counter
⎕NNAMES	Names of Open Native Files
⎕NNUMS	Tie Numbers of Open Native Files
⎕SI	State Indicator
⎕SYSID	System Identifier
⎕SYSVER	System Version
⎕T	Tickcount
⎕TC	Terminal Control Characters
⎕TCBEL	Terminal Control Character, Bell
⎕TCBS	Terminal Control Character, Backspace
⎕TCESC	Terminal Control Character, Escape
⎕TCFF	Terminal Control Character, Form Feed
⎕TCHT	Terminal Control Character, Horizontal Tab
⎕TCLF	Terminal Control Character, Line Feed
⎕TCNL	Terminal Control Character, New Line
⎕TCNUL	Terminal Control Character, Null
⎕TS	Time Stamp
⎕WA	Workspace Available
Monadic or dyadic system functions
⎕AT	Attributes
⎕CR	Canonical representation
⎕DC	Data Conversion
⎕DFT	Discrete Fourier Transform
⎕DL	Delay or pause APL processing
⎕DR	Data representation
⎕EA	Execute alternate
⎕EC	Execute controlled
⎕ERROR	Signal error
⎕ES	Event simulate
⎕EX	Expunge names
⎕FMT	Format
⎕FX	Function fix
⎕MF	Monitor function
⎕NAPPEND	Append data to an open native file
⎕NC	Name classification
⎕NCREATE	Create and open a native file
⎕NERASE	Erase an open native file
⎕NINFO	Native file information
⎕NL	Name list
⎕NREAD	Read data from an open native file
⎕NRENAME	Rename an open native file
⎕NREPLACE	Replace data in an open native file
⎕NRESIZE	Resize an open native file
⎕NSIZE	Get the size of an open native file
⎕NTIE	Open a native file
⎕NUNTIE	Close a native file
⎕STOP	Stop execution of a user-defined function/operator/hyperator or Magic Function
⎕TF	Transfer form
⎕TRACE	Trace execution of a user-defined function/operator/hyperator or Magic Function
⎕UCS	Universal character set
⎕VR	Vector representation of a function

See Also
System Commands	System Variables and Functions	Operators

Keyboard

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NARS 2000 Lang Tool Bar

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This NARS2000 article is a stub and needs further work.