Variable
A variable is a named location which can be assigned a value which can be retrieved and modified if desired. Like functions, variables in APL in general, and NARS2000 in particular, come in two flavors: user variables and system variables.
User variables
User variables come into existence when the creator of a workspace sets the value of the variable. Th rules for naming a user variable are as follows:
-- Do later --
System variables
System variables are created by NARS2000 when the program starts. They begin with the quad symbol ⎕, and one or more letters. The current list of system variables is as follows:
| System Variables | |
|---|---|
| ⎕ALX | Attention Latent Expression |
| ⎕CT | Comparison Tolerance |
| ⎕DM | Diagnostic Message (Read-only) |
| ⎕DT | Distribution Type |
| ⎕ELX | Error Latent Expression |
| ⎕FC | Format Control |
| ⎕FEATURE | Feature Control |
| ⎕FPC | Floating Point Control |
| ⎕IC | Indeterminate Control |
| ⎕IO | Index Origin |
| ⎕LR | Left-Right Direction Choice |
| ⎕LX | Latent Expression |
| ⎕PP | Print Precision |
| ⎕PR | Prompt Replacement |
| ⎕PW | Print Width |
| ⎕RL | Random Link |
| ⎕SA | Stop Action |
| ⎕WSID | Workspace Identifier |
| 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 {{#ifeq:{{{1}}}|1||title="assign" style="border-width:thick; border-color:blue; background-color:yellow;" |← |
→ | bgcolor=cyan | title="assign" |← | → | }}
{{#ifeq:{{{1}}}|2||title="plus" style="border-width:thick; border-color:blue; background-color:yellow;" |+ |
- | × | ÷ | * | ⍟ | ⌹ | ○ | ! | ? | √ | bgcolor=cyan | title="plus" |+ | - | × | ÷ | * | ⍟ | ⌹ | ○ | ! | ? | √ | }}
{{#ifeq:{{{1}}}|3||title="mod" style="border-width:thick; border-color:blue; background-color:yellow;" || |
⌈ | ⌊ | ⊥ | ⊤ | ⊣ | ⊢ | |||||||||||||||||||
| ⌈ | ⌊ | ⊥ | ⊤ | ⊣ | ⊢ | ||||||||||||||||||||||||||||||||||||||||||||||||
| ≢ | < | ≤ | = | ≥ | > | ≠ | bgcolor=cyan | title="match" |≡ | ≢ | < | ≤ | = | ≥ | > | ≠ | }}
{{#ifeq:{{{1}}}|5||title="down caret" style="border-width:thick; border-color:blue; background-color:yellow;" |∨ |
∧ | ⍱ | ⍲ | bgcolor=cyan | title="down caret" |∨ | ∧ | ⍱ | ⍲ | }}
{{#ifeq:{{{1}}}|6||title="take" style="border-width:thick; border-color:blue; background-color:yellow;" |↑ |
↓ | ⊂ | ⊃ | ⌷ | ⍋ | ⍒ | ||||||||||||||||||||||
| ↓ | ⊂ | ⊃ | ⌷ | ⍋ | ⍒ | ||||||||||||||||||||||||||||||||||||||||||||||||
| ∊ | ⍸ | ⍷ | ∪ | ∩ | ⊆ | ⊇ | ~ | § | π | .. | bgcolor=cyan | title="iota" |⍳ | ∊ | ⍸ | ⍷ | ∪ | ∩ | ⊆ | ⊇ | ~ | § | π | .. | }}
{{#ifeq:{{{1}}}|8||title="comma" style="border-width:thick; border-color:blue; background-color:yellow;" |, |
⍪ | ⍴ | ⌽ | ⊖ | ⍉ | ||||||||||||||||||||||||
| ⍪ | ⍴ | ⌽ | ⊖ | ⍉ | |||||||||||||||||||||||||||||||||||||||||||||||||
| \ | ⌿ | ⍀ | ⊙ | ¨ | ⍨ | ⍤ | ⍡ | ⍥ | ⍦ | . | ∘ | ⍠ | ‼ | ⌻ | ∂ | ∫ | bgcolor=cyan | title="slash" |/ | \ | ⌿ | ⍀ | ⊙ | ¨ | ⍨ | ⍤ | ⍣ | ⍡ | ⍥ | ⍦ | . | ∘ | ⍠ | ‼ | ⌻ | ∂ | ∫ | }}
{{#ifeq:{{{1}}}|10||title="quotequad" style="border-width:thick; border-color:blue; background-color:yellow;" |⍞ |
⎕ | ⍎ | ⍕ | |||||||||||||
| ⎕ | ⍎ | ⍕ | |||||||||||||||||||||||||||||||||||||||||||||||||||
| ⍝ | ∇ | ∆ | ⍙ | _ | ⍺ | ⍵ | bgcolor=cyan | title="diamond" |⋄ | ⍝ | ∇ | ∆ | ⍙ | _ | ⍺ | ⍵ | }}
{{#ifeq:{{{1}}}|12||title="neg" style="border-width:thick; border-color:blue; background-color:yellow;" |¯ |
⍬ | ∞ | title="neg" |¯ | ⍬ | ∞ | ∅ | |||||||||||||||||||||||||||||||
| colspan=8 |Second Row | i j k | a | b | e | g | p | r | v | x | z | colspan=8 |Second Row | i j k | a | b | e | g | p | r | v | x | z | colspan=8 |Second Row | i j k | a | b | e | g | p | r | v | x | z | colspan=6 |Second Row | i j k | i j k l | g | p | r | v | x
}} | |||||||||||||
{{#ifeq:{{{1}}}|0| |[[Category:Mouse Group {{{1}}}|{{{2}}}]]}}
- This NARS2000 article is a stub and needs further work.
