source: sourcecode/application/libraries/PHPExcel/Shared/JAMA/utils/Maths.php @ 1

<?php
/**
 *      @package JAMA
 *
 *      Pythagorean Theorem:
 *
 *      a = 3
 *      b = 4
 *      r = sqrt(square(a) + square(b))
 *      r = 5
 *
 *      r = sqrt(a^2 + b^2) without under/overflow.
 */
function hypo($a, $b) {
        if (abs($a) > abs($b)) {
                $r = $b / $a;
                $r = abs($a) * sqrt(1 + $r * $r);
        } elseif ($b != 0) {
                $r = $a / $b;
                $r = abs($b) * sqrt(1 + $r * $r);
        } else {
                $r = 0.0;
        }
        return $r;
}       //      function hypo()


/**
 *      Mike Bommarito's version.
 *      Compute n-dimensional hyotheneuse.
 *
function hypot() {
        $s = 0;
        foreach (func_get_args() as $d) {
                if (is_numeric($d)) {
                        $s += pow($d, 2);
                } else {
                        throw new PHPExcel_Calculation_Exception(JAMAError(ArgumentTypeException));
                }
        }
        return sqrt($s);
}
*/