note 35803 added to function.hypot

Too bad this function is not made generic: <?php /* Precondition: first and second argument are coordinates in the same euclidian space. Postcondition: function return value is equal to the distance of the first and the second vector or -1 if the two arguments are not in the same euclidian space. */ function gen_hypot(&$x, &$y) { /* check number of coordinates */ if (count($x) != count($y)) { /* no match, return an impossible value, -1 */ $r = -1; } else { for ($i = 0; $i < count($x); $i++) { $s = $x[$i] - $y[$i]; $r += $s * $s; } } return sqrt($r); } /* example call */ print gen_hypot(array(0, 0, 2), array(2, 3, 8)); /* output: 7 */ ?> like this. This will work for any euclidian coordinate system, not only for R^2. ---- Manual Page -- http://www.php.net/manual/en/function.hypot.php Edit Note -- http://master.php.net/manage/user-notes.php?action=edit+35803 Delete Note -- http://master.php.net/manage/user-notes.php?action=delete+35803&report=yes Reject Note -- http://master.php.net/manage/user-notes.php?action=reject+35803&report=yes