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 ⎕à |
| ⎕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 | ||||||||||||||
| A+S | ⍪ | ≡ | ≢ | ⍒ | ⍋ | ⌽ | ⍉ | ⊖ | ⍟ | ⍱ | ⍲ | ⍠ | ⌹ | |
| Alt | ⋄ | ¨ | ¯ | < | ≤ | ∅ | ≥ | > | ≠ | ∨ | ∧ | × | ÷ | |
| Sh | ~ | ! | @ | # | $ | % | ^ | & | * | ( | ) | _ | + | |
| Key | ` | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | - | = | |
| A+S | ⍷ | √ | ⍨ | ⍸ | ⍥ | ⍣ | ⍞ | ⍬ | ⊣ | |||||
| Alt | ? | ⍵ | ∊ | ⍴ | § | ↑ | ↓ | ⍳ | ○ | π | ← | → | ⊢ | |
| Sh | Q | W | E | R | T | Y | U | I | O | P | { | } | | | |
| Key | q | w | e | r | t | y | u | i | o | p | [ | ] | \ | |
| A+S | ∫ | ∂ | ⌻ | ⍢ | ⍙ | ⍤ | ⍫ | ⌷ | ||||||
| Alt | ⍺ | ⌈ | ⌊ | ∞ | ∇ | ∆ | ∘ | ‼ | ⎕ | ⍎ | ⍕ | |||
| Sh | A | S | D | F | G | H | J | K | L | : | " | |||
| Key | a | s | d | f | g | h | j | k | l | ; | ' | |||
| A+S | ⊆ | ⊇ | χ | ⍡ | ⍭ | ⊙ | ||||||||
| Alt | ⊂ | ⊃ | ∩ | ∪ | ⊥ | ⊤ | ⍦ | ⍝ | ⍀ | ⌿ | ||||
| Sh | Z | X | C | V | B | N | M | < | > | ? | ||||
| Key | z | x | c | v | b | n | m | , | . | / | ||||
| NARS 2000 Lang Tool Bar |
← | → | + | - | × | ÷ | * | ⍟ | ⌹ | ○ | ! | ? | √ | | | ⌈ | ⌊ | ⊥ | ⊤ | ⊣ | ⊢ | |||
| ≡ | ≢ | < | ≤ | = | ≥ | > | ≠ | ∨ | ∧ | ⍱ | ⍲ | ↑ | ↓ | ⊂ | ⊃ | ⌷ | ⍋ | ⍒ | |||||
| ⍳ | ∊ | ⍸ | ⍷ | ∪ | ∩ | ⊆ | ⊇ | ~ | § | π | .. | , | ⍪ | ⍴ | ⌽ | ⊖ | ⍉ | ||||||
| / | \ | ⌿ | ⍀ | ⊙ | ¨ | ⍨ | ⍤ | ⍣ | ⍡ | ⍥ | ⍦ | . | ∘ | ⍠ | ‼ | ⌻ | ∂ | ∫ | ⍞ | ⎕ | ⍎ | ⍕ | |
| ⋄ | ⍝ | ∇ | ∆ | ⍙ | _ | ⍺ | ⍵ | ¯ | ⍬ | ∞ | ∅ | ||||||||||||
| Second Row | i j k | i j k l | g | p | r | v | x | ||||||||||||||||
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- This NARS2000 article is a stub and needs further work.
