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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<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⌈/⍬<br />
<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⌈/⍬<br />
¯∞</apll><br /><br />
¯∞</apll><br /><br />
Symbolically zero or '''<apll>0</apll>''' represents '''number''' while tilde or '''<apll>{tilde}</apll>''' represents '''not.'''  Together the overstrike zilde symbol or '''<apll>⍬</apll>''' means ''not a number'', i.e. empty numeric vector.  APL frequently uses overstrike characters in '''dual-combined meaning,''' thus '''<apll>{quotequad}</apll>''' which is '''<apll>{quad}</apll>''' or prompt and the single quote symbol yielding ''prompt for string'' or <u>character input</u> '''versus''' '''<apll>{quad}</apll>''' or prompt for <u>numeric input</u>.<br>
==Example==
==Example==
The above examples for infinity and negative infinity correctly run in NARS2000. In '''theory ONLY - {zilde}''' would be hypothetically equivalent to <apll>⍳0</apll> or <apll>0⍴N</apll> (where N is any number) since zilde or {zilde} represents an empty numeric vector.
The above examples for infinity and negative infinity correctly run in NARS2000. In '''theory ONLY - {zilde}''' would be hypothetically equivalent to <apll>⍳0</apll> or <apll>0⍴N</apll> (where N is any number) since zilde or {zilde} represents an empty numeric vector.
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Latest revision as of 03:30, 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
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

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