ysjj-system/node_modules/mathjs/lib/esm/function/combinatorics/composition.js

import { factory } from '../../utils/factory.js';
var name = 'composition';
var dependencies = ['typed', 'addScalar', 'combinations', 'isNegative', 'isPositive', 'isInteger', 'larger'];
export var createComposition = /* #__PURE__ */factory(name, dependencies, _ref => {
  var {
    typed,
    addScalar,
    combinations,
    isPositive,
    isNegative,
    isInteger,
    larger
  } = _ref;
  /**
   * The composition counts of n into k parts.
   *
   * composition only takes integer arguments.
   * The following condition must be enforced: k <= n.
   *
   * Syntax:
   *
   *   math.composition(n, k)
   *
   * Examples:
   *
   *    math.composition(5, 3) // returns 6
   *
   * See also:
   *
   *    combinations
   *
   * @param {Number | BigNumber} n    Total number of objects in the set
   * @param {Number | BigNumber} k    Number of objects in the subset
   * @return {Number | BigNumber}     Returns the composition counts of n into k parts.
   */
  return typed(name, {
    'number | BigNumber, number | BigNumber': function numberBigNumberNumberBigNumber(n, k) {
      if (!isInteger(n) || !isPositive(n) || !isInteger(k) || !isPositive(k)) {
        throw new TypeError('Positive integer value expected in function composition');
      } else if (larger(k, n)) {
        throw new TypeError('k must be less than or equal to n in function composition');
      }
      return combinations(addScalar(n, -1), addScalar(k, -1));
    }
  });
});