feat:node-modules

node_modules/mathjs/lib/cjs/function/probability/multinomial.js

@@ -0,0 +1,56 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.createMultinomial = void 0;
+var _collection = require("../../utils/collection.js");
+var _factory = require("../../utils/factory.js");
+const name = 'multinomial';
+const dependencies = ['typed', 'add', 'divide', 'multiply', 'factorial', 'isInteger', 'isPositive'];
+const createMultinomial = exports.createMultinomial = /* #__PURE__ */(0, _factory.factory)(name, dependencies, _ref => {
+  let {
+    typed,
+    add,
+    divide,
+    multiply,
+    factorial,
+    isInteger,
+    isPositive
+  } = _ref;
+  /**
+   * Multinomial Coefficients compute the number of ways of picking a1, a2, ..., ai unordered outcomes from `n` possibilities.
+   *
+   * multinomial takes one array of integers as an argument.
+   * The following condition must be enforced: every ai <= 0
+   *
+   * Syntax:
+   *
+   *     math.multinomial(a) // a is an array type
+   *
+   * Examples:
+   *
+   *    math.multinomial([1,2,1]) // returns 12
+   *
+   * See also:
+   *
+   *    combinations, factorial
+   *
+   * @param {number[] | BigNumber[]} a    Integer numbers of objects in the subset
+   * @return {Number | BigNumber}         Multinomial coefficient.
+   */
+  return typed(name, {
+    'Array | Matrix': function (a) {
+      let sum = 0;
+      let denom = 1;
+      (0, _collection.deepForEach)(a, function (ai) {
+        if (!isInteger(ai) || !isPositive(ai)) {
+          throw new TypeError('Positive integer value expected in function multinomial');
+        }
+        sum = add(sum, ai);
+        denom = multiply(denom, factorial(ai));
+      });
+      return divide(factorial(sum), denom);
+    }
+  });
+});