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Long Term Support Release

  • Bug fixes for general core bugs in 3.9.x will end* 10 May 2021 (12 months).
  • Bug fixes for security issues in 3.9.x will end* 8 May 2023 (36 months).
  • PHP version: minimum PHP 7.2.0 Note: minimum PHP version has increased since Moodle 3.8. PHP 7.3.x and 7.4.x are supported too.
<?php

/**
 *
 * Function code for the complex atan() function
 *
 * @copyright  Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex)
 * @license    https://opensource.org/licenses/MIT    MIT
 */
namespace Complex;

//include_once 'Math/Complex.php';
//include_once 'Math/ComplexOp.php';

/**
 * Returns the inverse tangent of a complex number.
 *
 * @param     Complex|mixed    $complex    Complex number or a numeric value.
 * @return    Complex          The inverse tangent of the complex argument.
 * @throws    Exception        If argument isn't a valid real or complex number.
 * @throws    \InvalidArgumentException    If function would result in a division by zero
 */
< function atan($complex)
> function atan($complex): Complex
{ $complex = Complex::validateComplexArgument($complex); if ($complex->isReal()) { return new Complex(\atan($complex->getReal())); } $t1Value = new Complex(-1 * $complex->getImaginary(), $complex->getReal()); $uValue = new Complex(1, 0); $d1Value = clone $uValue; $d1Value = subtract($d1Value, $t1Value); $d2Value = add($t1Value, $uValue); $uResult = $d1Value->divideBy($d2Value); $uResult = ln($uResult); return new Complex( (($uResult->getImaginary() == M_PI) ? -M_PI : $uResult->getImaginary()) * -0.5, $uResult->getReal() * 0.5, $complex->getSuffix() ); }