Function melodicSimilarity

melodicSimilarity(a: MelodicPhrase, b: MelodicPhrase): number
How alike two lines are, in [0, 1].

The number compareMelodies reaches, for callers that only want to rank phrases: 1 for the same line — a transposition of it included, since the measure is built on intervals — and lower the further two lines are from being each other's variant. Symmetric in its arguments, and deterministic.
Parameters
- a: MelodicPhrase
  The first line: a motif, or plain note events.
- b: MelodicPhrase
  The second line.
Returns number
The likeness in [0, 1].
Example
```
import { melodicSimilarity } from '@libraz/libcantus';
const line = [
  { pitch: 60, startBeat: 0, durationBeat: 1 },
  { pitch: 62, startBeat: 1, durationBeat: 1 },
  { pitch: 64, startBeat: 2, durationBeat: 1 },
];
melodicSimilarity(line, line); // 1
```
- Defined in src/analyze/melody/similarity.ts:186