note 46965 added to ref.bc

Here's a function to compute the natural exponential function in arbitrary precision using the basic bcMath arithmetic operations. EXAMPLE: To compute the exponential function of 1.7 to 36 decimals: $y = bcExp("1.7", 36); The result: 4.331733759839529271053448625299468628 would be returned in variable $y NOTE: In practice, the last couple of digits may be inaccurate due to small rounding errors. If you require a specific degree of precision, always compute 3-4 decimals beyond the required precision. The program code for the natural exponential function is: ****************************************** Function bcExp($xArg, $NumDecimals) { $x = Trim($xArg); $PrevSum = $x - 1; $CurrTerm = 1; $CurrSum = bcAdd("1", $x, $NumDecimals); $n = 1; While (bcComp($CurrSum, $PrevSum, $NumDecimals)) { $PrevSum = $CurrSum; $CurrTerm = bcDiv(bcMul($CurrTerm, $x, $NumDecimals), $n + 1, $NumDecimals); $CurrSum = bcAdd($CurrSum, $CurrTerm, $NumDecimals); $n++; } Return $CurrSum; } ---- Manual Page -- http://www.php.net/manual/en/ref.bc.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+46965 Delete -- http://master.php.net/manage/user-notes.php?action=delete+46965&report=yes Reason: bad code -- http://master.php.net/manage/user-notes.php?action=delete+46965&report=yes&reason=bad+code Reason: spam -- http://master.php.net/manage/user-notes.php?action=delete+46965&report=yes&reason=spam Reason: useless example -- http://master.php.net/manage/user-notes.php?action=delete+46965&report=yes&reason=useless+example Reason: contains commercial links -- http://master.php.net/manage/user-notes.php?action=delete+46965&report=yes&reason=contains+commercial+links Reason: useless note -- http://master.php.net/manage/user-notes.php?action=delete+46965&report=yes&reason=useless+note Reject -- http://master.php.net/manage/user-notes.php?action=reject+46965&report=yes Search -- http://master.php.net/manage/user-notes.php