Variable: Difference between revisions

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A '''variable''' is a named location which can be assigned a value which can be retrieved and modified if desired. Variables in APL in general, and NARS2000 in particular, come in two flavors: user variables and system variables.
A '''variable''' is a named location which can be assigned a value which can be retrieved and modified if desired. Like [[function]]s, variables in APL in general, and NARS2000 in particular, come in two flavors: user variables and system variables.


==User variables==
==User variables==

Latest revision as of 10:44, 26 November 2014

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

[[Category:Mouse Group {{{1}}}|{{{2}}}]]



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