feat:node-modules

node_modules/mathjs/lib/esm/plain/number/combinations.js

@@ -0,0 +1,33 @@
+import { isInteger } from '../../utils/number.js';
+import { product } from '../../utils/product.js';
+export function combinationsNumber(n, k) {
+  if (!isInteger(n) || n < 0) {
+    throw new TypeError('Positive integer value expected in function combinations');
+  }
+  if (!isInteger(k) || k < 0) {
+    throw new TypeError('Positive integer value expected in function combinations');
+  }
+  if (k > n) {
+    throw new TypeError('k must be less than or equal to n');
+  }
+  var nMinusk = n - k;
+  var answer = 1;
+  var firstnumerator = k < nMinusk ? nMinusk + 1 : k + 1;
+  var nextdivisor = 2;
+  var lastdivisor = k < nMinusk ? k : nMinusk;
+  // balance multiplications and divisions to try to keep intermediate values
+  // in exact-integer range as long as possible
+  for (var nextnumerator = firstnumerator; nextnumerator <= n; ++nextnumerator) {
+    answer *= nextnumerator;
+    while (nextdivisor <= lastdivisor && answer % nextdivisor === 0) {
+      answer /= nextdivisor;
+      ++nextdivisor;
+    }
+  }
+  // for big n, k, floating point may have caused weirdness in remainder
+  if (nextdivisor <= lastdivisor) {
+    answer /= product(nextdivisor, lastdivisor);
+  }
+  return answer;
+}
+combinationsNumber.signature = 'number, number';