APL Puns

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.

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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