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Challenges

The Camelot Wheel

+3
−0

Given a musical key, output its number and letter on the Camelot Wheel (shown below).

Camelot Wheel

Input

A musical key as a string, as shown on the wheel. The words "Sharp" and "Flat" may be replaced with symbols (such as "#" and "b") if you wish.

Output

The number and letter, either as a string, tuple, or array.

Examples:

Input->Output
"E Major" -> "12B"
"F-Sharp Minor" -> "11A"
"Bb Minor" -> "3A"

This is code-golf.

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2 comments

This is suprisingly hard to compress well. Razetime‭ about 1 month ago

I know it's not directly related to the challenge, but reading the phrase "D-Flat Minor" gave me an aneurysm. (D-Flat Minor has 6 flats and a double flat, C# minor is just 4 sharps, way easier to work with) DJMcMayhem‭ 21 days ago

2 answers

+3
−0

Python 3, 101, 98, 94 bytes

First answer!

lambda s:f"{(('FCGDAEB'.index(s[0])-~-ord(s[5])*('-'in s)-3*('i'in s)-6)%12)+1}"+'BA'['i'in s]

Try it online!

Readable version:

def f(s):
 n="FCGDAEB".index(s[0])-6
 if '-' in s:
  n -= ord(s[5]-1)
 if 'i' in s:
  n -= 3

 return f"{(n%12)+1}"+'BA'['i'in s]

Python 3.9, 95, 91 bytes:

lambda s:f"{(('FCGDAEB'.index(s[0])-~-ord(s[5])*('-'in s)-3*(m:='i'in s)-6)%12)+1}"+'BA'[m]

Isn't the walrus operator great?

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1 comment

+1 for the walrus operator Quintec‭ 20 days ago

+1
−0

APL (Dyalog Unicode), 110 67 bytes

{(⍕((f⊖⍪'AEBFCGDAEBFD'),r⌽12↑¯6↑5⍴'-')⍳2↑⍵),⎕a⌷⍨1+0≠f←¯3+r←3×'i'∊⍵}

-43 bytes from dzaima.

Requires input exactly as shown in the diagram.

A bit fiddly with the compression, but works correctly.

In both circles, the notes come in the form AEBFCGDAEBFD, so it is rotated as per the level it identifies with.

The hyphens in each note's description also come in the same format(----- ), so that is rotated as per requirement as well.

Based on the above data, we can find the number of the note.

If it's a Major note, then we append a B. Otherwise A.

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1 comment

67 by mostly not changing the algorithm (except using DJ's trick with checking for minor with 'i'∊) dzaima‭ 20 days ago

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