|
|
|
|
Bookmark this on Delicious
Share on Facebook
 Slashdot It!
Digg  hypot
Calculate the length of the hypotenuse of a right-angle triangle
(PHP 4 >= 4.0.7, PHP 5)
Code Examples / Notes » hypot.org
to robinv at ecosse dot net: hypo(a, b, c) === hypo(a, hypo(b, c)) hypo(a, b, c, d) === hypo(a, hypo(b, hypo(c, d))) ... robinv
A simpler approach would be to allow an arbitrary number of parameters. That would allow for whatever number of dimensions you want *and* it would be backwards compatible with the current implementation. <?php function hypo() { $sum = 0; foreach (func_get_args() as $dimension) { if (!is_numeric($dimension)) return -1; $sum += pow($dimension, 2); } return sqrt($sum); } print hypo(); // vector in 0 dimensions, magnitude = 0. print hypo(1); // vector in 1 dimension, magnitude = 1. print hypo(3, 4); // vector in 2 dimensions, magnitude = 5. print hypo(2, 3, 6); // vector in 3 dimensions, magnitude = 7. ?> r. victor klassen
A correct implementation of hypot( x, y ) avoids the overflow that might otherwise happen if either x or y is large enough that when squared it would overflow, but the answer is small enough not to cause overflow.
|
