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Differences Between: [Versions 39 and 311]

   1  <?php
   2  
   3  /**
   4   *
   5   * Function code for the complex atan() function
   6   *
   7   * @copyright  Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex)
   8   * @license    https://opensource.org/licenses/MIT    MIT
   9   */
  10  namespace Complex;
  11  
  12  //include_once 'Math/Complex.php';
  13  //include_once 'Math/ComplexOp.php';
  14  
  15  /**
  16   * Returns the inverse tangent of a complex number.
  17   *
  18   * @param     Complex|mixed    $complex    Complex number or a numeric value.
  19   * @return    Complex          The inverse tangent of the complex argument.
  20   * @throws    Exception        If argument isn't a valid real or complex number.
  21   * @throws    \InvalidArgumentException    If function would result in a division by zero
  22   */
  23  function atan($complex)
  24  {
  25      $complex = Complex::validateComplexArgument($complex);
  26  
  27      if ($complex->isReal()) {
  28          return new Complex(\atan($complex->getReal()));
  29      }
  30  
  31      $t1Value = new Complex(-1 * $complex->getImaginary(), $complex->getReal());
  32      $uValue = new Complex(1, 0);
  33  
  34      $d1Value = clone $uValue;
  35      $d1Value = subtract($d1Value, $t1Value);
  36      $d2Value = add($t1Value, $uValue);
  37      $uResult = $d1Value->divideBy($d2Value);
  38      $uResult = ln($uResult);
  39  
  40      return new Complex(
  41          (($uResult->getImaginary() == M_PI) ? -M_PI : $uResult->getImaginary()) * -0.5,
  42          $uResult->getReal() * 0.5,
  43          $complex->getSuffix()
  44      );
  45  }