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<?php /** * * Function code for the complex theta() function * * @copyright Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex) * @license https://opensource.org/licenses/MIT MIT */ namespace Complex; /** * Returns the theta of a complex number. * This is the angle in radians from the real axis to the representation of the number in polar coordinates. * * @param Complex|mixed $complex Complex number or a numeric value. * @return float The theta value of the complex argument. * @throws Exception If argument isn't a valid real or complex number. */ if (!function_exists(__NAMESPACE__ . '\\theta')) { function theta($complex): float { $complex = Complex::validateComplexArgument($complex); if ($complex->getReal() == 0.0) { if ($complex->isReal()) { return 0.0; } elseif ($complex->getImaginary() < 0.0) { return M_PI / -2; } return M_PI / 2; } elseif ($complex->getReal() > 0.0) { return \atan($complex->getImaginary() / $complex->getReal()); } elseif ($complex->getImaginary() < 0.0) { return -(M_PI - \atan(\abs($complex->getImaginary()) / \abs($complex->getReal()))); } return M_PI - \atan($complex->getImaginary() / \abs($complex->getReal())); } }