note 47682 added to ref.bc

Like any other bc function, you can't trust the last couple of digits, but everything else seems to check out. If you want to use this for anything important, you may want to verify this against other sources of pi before use. This function calculates 100 decimal places of pi in 329 iterations -- not exactly fast (each iteration calls the factorial function, from below, twice), so I try to avoid calling it more than once. <? //arbitrary precision pi approximator //author tom boothby //free for any use function bcpi() { $r=2; $i=0; $or=0; while(bccomp($or,$r)) { $i++; $or=$r; $r = bcadd($r,bcdiv(bcmul(bcpow(bcfact($i),2), bcpow(2,$i+1)),bcfact(2*$i+1))); } return $r; } ?> ---- Manual Page -- http://www.php.net/manual/en/ref.bc.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+47682 Delete -- http://master.php.net/manage/user-notes.php?action=delete+47682&report=yes Reason: bad code -- http://master.php.net/manage/user-notes.php?action=delete+47682&report=yes&reason=bad+code Reason: spam -- http://master.php.net/manage/user-notes.php?action=delete+47682&report=yes&reason=spam Reason: useless example -- http://master.php.net/manage/user-notes.php?action=delete+47682&report=yes&reason=useless+example Reason: contains commercial links -- http://master.php.net/manage/user-notes.php?action=delete+47682&report=yes&reason=contains+commercial+links Reason: useless note -- http://master.php.net/manage/user-notes.php?action=delete+47682&report=yes&reason=useless+note Reject -- http://master.php.net/manage/user-notes.php?action=reject+47682&report=yes Search -- http://master.php.net/manage/user-notes.php