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×⍳⍺)÷ |
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 |
┌──┬──┬──┬──┬──┬──┬──┬──┐ |
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