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<?php /** * * Function code for the complex log2() function * * @copyright Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex) * @license https://opensource.org/licenses/MIT MIT */ namespace Complex; /** * Returns the base-2 logarithm of a complex number. * * @param Complex|mixed $complex Complex number or a numeric value. * @return Complex The base-2 logarithm of the complex argument. * @throws Exception If argument isn't a valid real or complex number. * @throws \InvalidArgumentException If the real and the imaginary parts are both zero */ if (!function_exists(__NAMESPACE__ . '\\log2')) { function log2($complex): Complex { $complex = Complex::validateComplexArgument($complex); if (($complex->getReal() == 0.0) && ($complex->getImaginary() == 0.0)) { throw new \InvalidArgumentException(); } elseif (($complex->getReal() > 0.0) && ($complex->getImaginary() == 0.0)) { return new Complex(\log($complex->getReal(), 2), 0.0, $complex->getSuffix()); } return ln($complex) ->multiply(\log(Complex::EULER, 2)); } }