LKSunny wrote: > i know it can make simple function, if have Statistics knowledge... > I don't think you need to know much about statistics - AFAIK, the harmonic mean of a group of numbers is simply the reciprocal of the 'normal' mean: harmonic_mean(3,4,5,6) = 1/mean(3,4,5,6) /Per Jessen, Zürich -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
