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   1  <?php
   2  /**
   3   *    @package JAMA
   4   *
   5   *    Pythagorean Theorem:
   6   *
   7   *    a = 3
   8   *    b = 4
   9   *    r = sqrt(square(a) + square(b))
  10   *    r = 5
  11   *
  12   *    r = sqrt(a^2 + b^2) without under/overflow.
  13   */
  14  function hypo($a, $b) {
  15      if (abs($a) > abs($b)) {
  16          $r = $b / $a;
  17          $r = abs($a) * sqrt(1 + $r * $r);
  18      } elseif ($b != 0) {
  19          $r = $a / $b;
  20          $r = abs($b) * sqrt(1 + $r * $r);
  21      } else {
  22          $r = 0.0;
  23      }
  24      return $r;
  25  }    //    function hypo()
  26  
  27  
  28  /**
  29   *    Mike Bommarito's version.
  30   *    Compute n-dimensional hyotheneuse.
  31   *
  32  function hypot() {
  33      $s = 0;
  34      foreach (func_get_args() as $d) {
  35          if (is_numeric($d)) {
  36              $s += pow($d, 2);
  37          } else {
  38              throw new PHPExcel_Calculation_Exception(JAMAError(ArgumentTypeException));
  39          }
  40      }
  41      return sqrt($s);
  42  }
  43  */