code: public static MathEquation[] rank(UScale scale) {
          double[] x = extractX(scale);
          double[] y = extractY(scale);
          return rank(x, y);
      }
docs: From the scaling results calculate a number of scaling equations, and return their equations in descending order of relevance
  @param scale the Scale results to rank
  @return the possible equations in best-fit-first order.