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BQN, 29 28 bytes (⍉≍""){⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩}´⟜⌽'@'+↕ Try it here! Explanation: (⍉≍""){⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩}´⟜⌽'@'+↕ # a function taking a single argument ⍉≍"" # a 0-by-1 matrix (...

posted 6mo ago by dzaima‭ · edited 6mo ago by dzaima‭

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#3: Post edited by

dzaima‭ · 2024-07-02T11:54:31Z (6 months ago)

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~~# BQN, 29 bytes~~
```bqn
~~(≍""){⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩}´⟜⌽'@'+1↓↕~~
```
~~[Try it here!](https://mlochbaum.github.io/BQN/try.html#code=RiDihpAgKOKJjSIiKXvijYnijL3wnZWp4oi+y5jwnZWo4qWKy5zii4jLnOKJoPCdlal9wrTin5zijL0nQCcrMeKGk+KGlQpGIDc=)~~
Explanation:
```bqn
~~(≍""){⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩}´⟜⌽'@'+1↓↕ # a function taking a single argument~~
~~≍"" # a 1-by-0 character matrix~~
(≍""){ }´ # right fold with the initial value of ≍""
~~⟜⌽ # (but reverse the list to make it a left fold)~~
~~↕ # range; 0 1 2 3 4 … input-1~~
~~1↓ # drop the first element; 1 2 3 4 … input-1~~
~~'@'+ # plus the character '@' ('A' = '@'+1); "ABCDEF…"~~
~~{⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩} # fold operand: 𝕨 - current character, 𝕩 - accumulator - the matrix~~
~~≠𝕩 # numbers of rows in the matrix~~
~~⋈˜ # paired with itself (7 → [7,7])~~
~~𝕨⥊˜ # reshape 𝕨 that much~~
~~𝕩∾˘ # concatenate horizontally to 𝕩~~
~~⍉⌽ # rotate 90° clockwise (reverse vertically, transpose)~~
```

# BQN, <s>29</s> 28 bytes
```bqn
(⍉≍""){⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩}´⟜⌽'@'+↕
```
[Try it here!](https://mlochbaum.github.io/BQN/try.html#code=RiDihpAgKOKNieKJjSIiKXvijYnijL3wnZWp4oi+y5jwnZWo4qWKy5zii4jLnOKJoPCdlal9wrTin5zijL0nQCcr4oaVCkYgNw==)
Explanation:
```bqn
(⍉≍""){⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩}´⟜⌽'@'+↕ # a function taking a single argument
⍉≍"" # a 0-by-1 matrix
(⍉≍""){ }´ # right fold with the initial value of the 0-by-1 matrix
⟜⌽ # (but reverse the list to make it a left fold)
↕ # range; 0 1 2 3 4 … input-1
'@'+ # plus the character '@'; "@ABCDEF…"
{⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩} # fold operand: 𝕨 - current character, 𝕩 - accumulator - the matrix
≠𝕩 # numbers of rows in the matrix
⋈˜ # paired with itself (7 → [7,7])
𝕨⥊˜ # reshape 𝕨 that much
𝕩∾˘ # concatenate horizontally to 𝕩
⍉⌽ # rotate 90° clockwise (reverse vertically, transpose)
```

#2: Post edited by

dzaima‭ · 2024-07-02T11:47:09Z (6 months ago)

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~~# BQN, 28 bytes~~
```bqn
(≍""){⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩}´⟜⌽'@'+1↓↕
```
[Try it here!](https://mlochbaum.github.io/BQN/try.html#code=RiDihpAgKOKJjSIiKXvijYnijL3wnZWp4oi+y5jwnZWo4qWKy5zii4jLnOKJoPCdlal9wrTin5zijL0nQCcrMeKGk+KGlQpGIDc=)
Explanation:
```bqn
(≍""){⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩}´⟜⌽'@'+1↓↕ # a function taking a single argument
≍"" # a 1-by-0 character matrix
(≍""){ }´ # right fold with the initial value of ≍""
⟜⌽ # (but reverse the list to make it a left fold)
↕ # range; 0 1 2 3 4 … input-1
1↓ # drop the first element; 1 2 3 4 … input-1
'@'+ # plus the character '@' ('A' = '@'+1); "ABCDEF…"
{⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩} # fold operand: 𝕨 - current character, 𝕩 - accumulator - the matrix
≠𝕩 # numbers of rows in the matrix
⋈˜ # paired with itself (7 → [7,7])
𝕨⥊˜ # reshape 𝕨 that much
𝕩∾˘ # concatenate horizontally to 𝕩
⍉⌽ # rotate 90° clockwise (reverse vertically, transpose)
```

# BQN, 29 bytes
```bqn
(≍""){⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩}´⟜⌽'@'+1↓↕
```
[Try it here!](https://mlochbaum.github.io/BQN/try.html#code=RiDihpAgKOKJjSIiKXvijYnijL3wnZWp4oi+y5jwnZWo4qWKy5zii4jLnOKJoPCdlal9wrTin5zijL0nQCcrMeKGk+KGlQpGIDc=)
Explanation:
```bqn
(≍""){⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩}´⟜⌽'@'+1↓↕ # a function taking a single argument
≍"" # a 1-by-0 character matrix
(≍""){ }´ # right fold with the initial value of ≍""
⟜⌽ # (but reverse the list to make it a left fold)
↕ # range; 0 1 2 3 4 … input-1
1↓ # drop the first element; 1 2 3 4 … input-1
'@'+ # plus the character '@' ('A' = '@'+1); "ABCDEF…"
{⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩} # fold operand: 𝕨 - current character, 𝕩 - accumulator - the matrix
≠𝕩 # numbers of rows in the matrix
⋈˜ # paired with itself (7 → [7,7])
𝕨⥊˜ # reshape 𝕨 that much
𝕩∾˘ # concatenate horizontally to 𝕩
⍉⌽ # rotate 90° clockwise (reverse vertically, transpose)
```

#1: Initial revision by

dzaima‭ · 2024-07-02T11:46:34Z (6 months ago)

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# BQN, 28 bytes

```bqn
(≍""){⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩}´⟜⌽'@'+1↓↕
```
[Try it here!](https://mlochbaum.github.io/BQN/try.html#code=RiDihpAgKOKJjSIiKXvijYnijL3wnZWp4oi+y5jwnZWo4qWKy5zii4jLnOKJoPCdlal9wrTin5zijL0nQCcrMeKGk+KGlQpGIDc=)

Explanation:

```bqn
(≍""){⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩}´⟜⌽'@'+1↓↕  # a function taking a single argument
 ≍""                           # a 1-by-0 character matrix
(≍""){            }´           # right fold with the initial value of ≍""
                    ⟜⌽         #   (but reverse the list to make it a left fold)
                            ↕  # range; 0 1 2 3 4 … input-1
                          1↓   # drop the first element; 1 2 3 4 … input-1
                      '@'+     # plus the character '@' ('A' = '@'+1); "ABCDEF…"

     {⍉⌽𝕩∾˘𝕨⥊˜⋈˜≠𝕩}            # fold operand: 𝕨 - current character, 𝕩 - accumulator - the matrix
                ≠𝕩             # numbers of rows in the matrix
              ⋈˜               # paired with itself (7 → [7,7])
           𝕨⥊˜                 # reshape 𝕨 that much
        𝕩∾˘                    # concatenate horizontally to 𝕩
      ⍉⌽                       # rotate 90° clockwise (reverse vertically, transpose)
     
                      
```

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