feat:node-modules

node_modules/mathjs/lib/esm/function/arithmetic/log2.js

@@ -0,0 +1,68 @@
+import { factory } from '../../utils/factory.js';
+import { deepMap } from '../../utils/collection.js';
+import { log2Number } from '../../plain/number/index.js';
+var name = 'log2';
+var dependencies = ['typed', 'config', 'Complex'];
+export var createLog2 = /* #__PURE__ */factory(name, dependencies, _ref => {
+  var {
+    typed,
+    config,
+    Complex
+  } = _ref;
+  /**
+   * Calculate the 2-base of a value. This is the same as calculating `log(x, 2)`.
+   *
+   * For matrices, the function is evaluated element wise.
+   *
+   * Syntax:
+   *
+   *    math.log2(x)
+   *
+   * Examples:
+   *
+   *    math.log2(0.03125)           // returns -5
+   *    math.log2(16)                // returns 4
+   *    math.log2(16) / math.log2(2) // returns 4
+   *    math.pow(2, 4)               // returns 16
+   *
+   * See also:
+   *
+   *    exp, log, log1p, log10
+   *
+   * @param {number | BigNumber | Complex | Array | Matrix} x
+   *            Value for which to calculate the logarithm.
+   * @return {number | BigNumber | Complex | Array | Matrix}
+   *            Returns the 2-base logarithm of `x`
+   */
+  return typed(name, {
+    number: function number(x) {
+      if (x >= 0 || config.predictable) {
+        return log2Number(x);
+      } else {
+        // negative value -> complex value computation
+        return _log2Complex(new Complex(x, 0));
+      }
+    },
+    Complex: _log2Complex,
+    BigNumber: function BigNumber(x) {
+      if (!x.isNegative() || config.predictable) {
+        return x.log(2);
+      } else {
+        // downgrade to number, return Complex valued result
+        return _log2Complex(new Complex(x.toNumber(), 0));
+      }
+    },
+    'Array | Matrix': typed.referToSelf(self => x => deepMap(x, self))
+  });
+
+  /**
+   * Calculate log2 for a complex value
+   * @param {Complex} x
+   * @returns {Complex}
+   * @private
+   */
+  function _log2Complex(x) {
+    var newX = Math.sqrt(x.re * x.re + x.im * x.im);
+    return new Complex(Math.log2 ? Math.log2(newX) : Math.log(newX) / Math.LN2, Math.atan2(x.im, x.re) / Math.LN2);
+  }
+});