---
title: "First functions"
author: "Jeremy Howard"
date: "2022-07-05"
categories: [Dyalog, APL, Glyphs]
---
]box on -style=max -trains=tree -fns=on

1 = 1

1 = 1 2

1 = 1 1

'Banana' = 'aaaaaa'

'Banana' = 'a'

'Banana' 'Apple' 'Candy' = 'a'

≠22 10 22 22 21 10 5 10

≠ 'Banana'

≠ 'Mississippi'

1 2 3 ≠ 4 2 ¯1

7 ≠ '7'

1 2 3 < 4 2 ¯1

1 2 3 < 2

1 2 3 > 4 2 ¯1

1 2 3 > 2

1 2 3 ≤ 4 2 ¯1

1 2 3 ≤ 2

1 2 3 ≥ 4 2 ¯1

1 2 3 ≥ 2

≡ 7

≡ 'abc'

(1 2)(3 4)

≡ (1 2)(3 4)

(1 2)(3 4) (5 (6 7))

≡ (1 2)(3 4) (5 (6 7))

1 ≡ 1

1 ≡ 0

1 ≡ 1 1

≢ 1 2 3

⍴ 1 2 3

≢ 2 3 ⍴ ⍳6

≢ 3 2 ⍴ ⍳6

1 ≢ 1

1 ≢ 0

1 ≢ 1 1

0 1 0 1 ∨ 0 0 1 1  ⍝ Truth table for *or*

15 1 2 7 ∨ 35 1 4 0  ⍝ GCD

 0 1 0 1 ⍱ 0 0 1 1  ⍝ Truth table for *nor*

0 1 0 1 ∧ 0 0 1 1  ⍝ Truth table for *and*

15 1 2 7 ∧ 35 1 4 0  ⍝ LCM

~ 0 1  ⍝ Truth table for *not*

3 1 4 1 5 ~ 5 1

'aa' 'bb' 'cc' 'bb'  ~ 'bb' 'xx'

(1 2) 3 ~ ⊂1 2

 0 1 0 1 ⍲ 0 0 1 1  ⍝ Truth table for *nand*

~ 0 1 0 1 ∧ 0 0 1 1  ⍝ Truth table for *nand*

v←22 10 22 22 21 10 5 10
≠v

(≠v)/v

3 1 3 1 3 1 / 'Banana'

⍳4

⍳2 3

2 3 ⍴ ⍳6

1+2×⍳6

⍳0

1 3 6 5 4 ⍳ 3

'ABCDABCDEF' ⍳ 'ACFG'

⎕←mat←3 2 ⍴ ⍳6

mat←3 2 ⍴ ⍳6
mat ⍳ 5 6

⍸ 1 0 0 1 1

⍸1 2 3

⍸ 2 0 0 2 1

⎕←bmat ← 2 3 ⍴ 0 1 0 1 0 1
⍸ bmat

⎕←bmat ← 2 3 ⍴ 0 2 0 2 0 2
⍸ bmat

2 4 6 ⍸ 1 2 3 4 5 6 7

'AEIOU' ⍸ 'DYALOG'

⎕←mat←3 2⍴⍳6

mat ⍸ 3 3

mat ⍸ 3 5

mat ⍸ 2 2 ⍴ 3 3 3 5

⌈ 3.4 ¯3.4 3 0

3⌈2

3 2⌈2 3

4 ⌈ 6 ⌈ 2

a ← ¯4 6 2
0 ⌈ a

⌊ 3.4 ¯3.4 3 0

4 ⌊ 6 ⌊ 2.5