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node_modules/tstl/numeric/special_math/gamma.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.lgamma = exports.tgamma = void 0;
+//================================================================
+/**
+ * @packageDocumentation
+ * @module std
+ */
+//================================================================
+/**
+ * Gamma function.
+ *
+ * @reference https://en.wikipedia.org/wiki/Gamma_function, https://rosettacode.org/wiki/Gamma_function#JavaScript
+ */
+function tgamma(x) {
+    if (x < 0.5)
+        return Math.PI / (Math.sin(Math.PI * x) * tgamma(1 - x));
+    /*else if (x >= 1 && x === Math.floor(x))
+        return base.MathUtil.factorial(x - 1);*/
+    x -= 1;
+    var a = P[0];
+    var t = x + G + 0.5;
+    for (var i = 1; i < P.length; ++i)
+        a += P[i] / (x + i);
+    return Math.sqrt(2 * Math.PI) * Math.pow(t, x + 0.5) * Math.exp(-t) * a;
+}
+exports.tgamma = tgamma;
+/**
+ * Log gamma function.
+ */
+function lgamma(x) {
+    return Math.log(tgamma(x));
+}
+exports.lgamma = lgamma;
+var P = [
+    0.99999999999980993, 676.5203681218851, -1259.1392167224028,
+    771.32342877765313, -176.61502916214059, 12.507343278686905,
+    -0.13857109526572012, 9.9843695780195716e-6, 1.5056327351493116e-7,
+];
+var G = 7;
+//# sourceMappingURL=gamma.js.map