Symbol Zilde: Difference between revisions

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__NOTOC__
__NOTOC__
<h2> {zilde} &mdash; Represents an '''empty numeric vector''' or ''zero plus tilde'' (hence zilde) &mdash; Keystroke Alt + Shift + }  &mdash; Character ⎕UCS '⍬' = 9068</h2>
<h2> {zilde} &mdash; Represents an '''empty numeric vector''' or ''zero plus tilde'' (hence zilde) &mdash; Keystroke Alt + Shift + }  &mdash; Character  
==Usage==
==Usage==
<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⌊/⍬<br />
<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⌊/⍬<br />
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{{Page footer|12|Z}}
{{Article footer|12|Z}}

Latest revision as of 04:30, 13 October 2019

⍬ — Represents an empty numeric vector or zero plus tilde (hence zilde) — Keystroke Alt + Shift + } — Character

Usage

      ⌊/⍬
∞

      ⌈/⍬
¯∞

Symbolically zero or 0 represents number while tilde or ∼ represents not. Together the overstrike zilde symbol or ⍬ means not a number, i.e. empty numeric vector. APL frequently uses overstrike characters in dual-combined meaning, thus ⍞ which is ⎕ or prompt and the single quote symbol yielding prompt for string or character input versus ⎕ or prompt for numeric input.

Example

The above examples for infinity and negative infinity correctly run in NARS2000. In theory ONLY - ⍬ would be hypothetically equivalent to ⍳0 or 0⍴N (where N is any number) since zilde or ⍬ represents an empty numeric vector.

See Also

Infinity ∞



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 , . /
{{#ifeq:12|4||title="match" style="border-width:thick; border-color:blue; background-color:yellow;"|≡ {{#ifeq:12|7||title="iota" style="border-width:thick; border-color:blue; background-color:yellow;" |⍳ {{#ifeq:12|9||title="slash" style="border-width:thick; border-color:blue; background-color:yellow;" |/ {{#ifeq:12|11||title="diamond" style="border-width:thick; border-color:blue; background-color:yellow;" |⋄ {{#switch: 12
NARS 2000 Lang
Tool
Bar

{{#ifeq:12|1||title="assign" style="border-width:thick; border-color:blue; background-color:yellow;" |←

→ bgcolor=cyan title="assign" |← → }}

{{#ifeq:12|2||title="plus" style="border-width:thick; border-color:blue; background-color:yellow;" |+

- × ÷ * ⍟ ⌹ ○ ! ? √ bgcolor=cyan title="plus" |+ - × ÷ * ⍟ ⌹ ○ ! ? √ }}

{{#ifeq:12|3||title="mod" style="border-width:thick; border-color:blue; background-color:yellow;" ||

⌈ ⌊ ⊥ ⊤ ⊣ ⊢
⌈ ⌊ ⊥ ⊤ ⊣ ⊢
≢ < ≤ = ≥ > ≠ bgcolor=cyan title="match" |≡ ≢ < ≤ = ≥ > ≠ }}

{{#ifeq:12|5||title="down caret" style="border-width:thick; border-color:blue; background-color:yellow;" |∨

∧ ⍱ ⍲ bgcolor=cyan title="down caret" |∨ ∧ ⍱ ⍲ }}

{{#ifeq:12|6||title="take" style="border-width:thick; border-color:blue; background-color:yellow;" |↑

↓ ⊂ ⊃ ⌷ ⍋ ⍒
↓ ⊂ ⊃ ⌷ ⍋ ⍒
∊ ⍸ ⍷ ∪ ∩ ⊆ ⊇ ~ § π .. bgcolor=cyan title="iota" |⍳ ∊ ⍸ ⍷ ∪ ∩ ⊆ ⊇ ~ § π .. }}

{{#ifeq:12|8||title="comma" style="border-width:thick; border-color:blue; background-color:yellow;" |,

⍪ ⍴ ⌽ ⊖ ⍉
⍪ ⍴ ⌽ ⊖ ⍉
\ ⌿ ⍀ ⊙ ¨ ⍨ ⍤ ⍡ ⍥ ⍦ . ∘ ⍠ ‼ ⌻ ∂ ∫ bgcolor=cyan title="slash" |/ \ ⌿ ⍀ ⊙ ¨ ⍨ ⍤ ⍣ ⍡ ⍥ ⍦ . ∘ ⍠ ‼ ⌻ ∂ ∫ }}

{{#ifeq:12|10||title="quotequad" style="border-width:thick; border-color:blue; background-color:yellow;" |⍞

⎕ ⍎ ⍕
⎕ ⍎ ⍕
⍝ ∇ ∆ ⍙ _ ⍺ ⍵ bgcolor=cyan title="diamond" |⋄ ⍝ ∇ ∆ ⍙ _ ⍺ ⍵ }}

{{#ifeq:12|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:12|0| |}}

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