Daily Archives: December 16, 2015

APL Puns

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In the Beginning

⌊ floor
⌈ ceiling
⍟ log

⌊ and ⌈ were punnish when the notation was introduced in 1962. They have long since gone mainstream, used even by respectable mathematicians and computer scientists.

To see why ⍟ is a pun, see the Vector article My Favourite APL Symbol.

•         •        •        •         •

The following are a joint effort by the Dyalog team, many derived after a sumptuous dinner and a few glasses of wine. Column 0 are valid APL expressions. For an enhanced experience may we suggest covering column 1 as you read column 0 for the first time.

In Modern Times

⊃⎕A~'L' the first no el
⍴⍴⍴'your boat' rho rho rho your boat
*⍣¯1⊢fly+fly log of the flies
{⍺←23 ⋄ (2÷(○1)*0.5)×-/⍵×(⍵*2×⍳⍺)÷
(!⍳⍺)×1+2×⍳⍺}ghanistan		 erf ghanistan
↑^≡ mix and match
>/+/∘⎕UCS¨'the parts' 'the whole' the sum of the parts is greater than the whole
?⍨2e9 a big deal
○1 APL π
2(⌷⍤1)2 3 4⍴○1 a slice of APL π
0 0⍉3 4⍴○1 another slice of APL π
easy←○1 easy as π
{4×-/÷1+2×⍳⍵}1e6 a π long in the making
↑ pike; see APL Quotations and Anecdotes
↓ spike
⍋ pine
⍒ spine
⍋ Concorde taking (and showing) off
⍒ uh-oh
{⍵⌷⍨⊂?⍨≢⍵} degrade
bb∨~bb two b or not two b
bb≥bb two b or not two b
×× sign of the times
a←2÷⍨3 4⍴⍳12 ⋄ *○0j1×a show off
a←2÷⍨3 4⍴⍳12 ⋄ *○0j1×a+2e9 shameless show off
⍎turtles←'⍎turtles' it’s turtles all the way down…

In Honour of a Certain Movie Series

0⍴'menace' I. The Empty Menace
⊢⎕ns¨ 2⍴⎕this II. Tack of the Clones
⌽'htxiS'~'x' III. Reverse of the Sith
⎕io←~⎕io IV. A New Beginning
{'Jedi'⊢1e3×○R} V. The M π R Strikes from the Back
{'Jedi'} VI. Return Jedi
(+⌿÷≢)3 4 5⊣⎕dl 10 VII. The Fork Awakens
may←+⌿÷≢ ⋄ may∘∪ may the fork be with you
0 1 2 3 (⌊/⍬) 5 6 the fourth is strong with this one
4 4 4 4 (⌊/⍬) 4 4 I feel a great disturbance in the fours
1=?2e9 this is not the number you are looking for
1=?2e9 in my experience, there’s no such thing as luck
Luke.## I AM your father
4 ⊃ 0 1 2 3 'dark side' vier ist the path to the dark side
x{0.5×⍵+⍺÷⍵}⍣≡darkside do not underestimate the power of the dark side
⎕ct←1 I find your lack of faith disturbing
0.2 ∊ ÷3 1 4 1 9 2 6 3 8 9 7 9 I find your lack of a-fifth disturbing
{0::⍺⍺~⍵ ⋄ ⍺⍺ ⍵} do, or do not; there is no :Try
⍝ R2D2
>⍝ Help me, Obi-Wan Kenobi, you’re my only hope
⊂○⊃ Princess Leia
<○> Yoda
○>--- Death Star
>∘< X-wing fighter
⊢○⊣ tie fighter
○⍨ tie fighter in stealth
⊢○⊣ 1 π fighter
⊣⍲⍲ ATAT
⍤ Ewok
⍥ Wookie
⍋ imperial cruiser
⍋⍒ imperial cruisers colliding
┌──┬──┬──┬──┬──┬──┬──┬──┐
│⊢ │⍒ │⍒⍒│⍋⌽│⌽ │⍋ │⍋⍒│⍒⌽│
├──┼──┼──┼──┼──┼──┼──┼──┤
│⍒ │⍒⍒│⍋⌽│⊢ │⍒⌽│⌽ │⍋ │⍋⍒│
├──┼──┼──┼──┼──┼──┼──┼──┤
│⍒⍒│⍋⌽│⊢ │⍒ │⍋⍒│⍒⌽│⌽ │⍋ │
├──┼──┼──┼──┼──┼──┼──┼──┤
│⍋⌽│⊢ │⍒ │⍒⍒│⍋ │⍋⍒│⍒⌽│⌽ │
├──┼──┼──┼──┼──┼──┼──┼──┤
│⌽ │⍋ │⍋⍒│⍒⌽│⊢ │⍒ │⍒⍒│⍋⌽│
├──┼──┼──┼──┼──┼──┼──┼──┤
│⍋ │⍋⍒│⍒⌽│⌽ │⍋⌽│⊢ │⍒ │⍒⍒│
├──┼──┼──┼──┼──┼──┼──┼──┤
│⍋⍒│⍒⌽│⌽ │⍋ │⍒⍒│⍋⌽│⊢ │⍒ │
├──┼──┼──┼──┼──┼──┼──┼──┤
│⍒⌽│⌽ │⍋ │⍋⍒│⍒ │⍒⍒│⍋⌽│⊢ │
└──┴──┴──┴──┴──┴──┴──┴──┘

 

 

 

climatic space battle
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