@thi.ng/distance/manhattan.js

N-dimensional distance metrics & K-nearest neighborhoods for point queries

import {
  distManhattan,
  distManhattan2,
  distManhattan3
} from "@thi.ng/vectors/dist-manhattan";
class Manhattan {
  constructor(dim, metric) {
    this.dim = dim;
    this.metric = metric;
    this._invD = this.dim / Math.sqrt(dim);
  }
  dim;
  metric;
  _invD;
  to(x) {
    return x * this._invD;
  }
  from(x) {
    return Math.sqrt((x / this.dim) ** 2 * this.dim);
  }
}
const defManhattan = (dim) => new Manhattan(dim, distManhattan);
const MANHATTAN2 = new Manhattan(2, distManhattan2);
const MANHATTAN3 = new Manhattan(3, distManhattan3);
export {
  MANHATTAN2,
  MANHATTAN3,
  Manhattan,
  defManhattan
};