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Viewing file:     rational-pow.js (704 B)      -rw-r--r--

/*
Fraction.js v5.0.0 10/1/2024
https://raw.org/article/rational-numbers-in-javascript/

Copyright (c) 2024, Robert Eisele (https://raw.org/)
Licensed under the MIT license.
*/
const Fraction = require('fraction.js');
 
// Calculates (a/b)^(c/d) if result is rational
// Derivation: https://raw.org/book/analysis/rational-numbers/
function root(a, b, c, d) {

  // Initial estimate
  let x = Fraction(100 * (Math.floor(Math.pow(a / b, c / d)) || 1), 100);
  const abc = Fraction(a, b).pow(c);

  for (let i = 0; i < 30; i++) {
    const n = abc.mul(x.pow(1 - d)).sub(x).div(d).add(x)

    if (x.n === n.n && x.d === n.d) {
      return n;
    }
    x = n;
  }
  return null;
}

root(18, 2, 1, 2); // 3/1