Function pca

pca(
    points: readonly Writable<Vec>[],
): {
    majorLength: Writable<Num>;
    mean: Writable<Vec>;
    minorLength: Writable<Num>;
    rotation: Writable<Num>;
}
K points → {mean: centroid, rotation: dominant-eigenvector angle, majorLength/minorLength: per-axis std-devs (√λ)}. Each write is a single group action about the mean, so all pairs are cross-channel invariant.
Parameters
- points: readonly Writable<Vec>[]
Returns {
    majorLength: Writable<Num>;
    mean: Writable<Vec>;
    minorLength: Writable<Num>;
    rotation: Writable<Num>;
}
- Defined in src/core/lenses/point-cloud.ts:288