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<?php /* ** mathlib v1.2.1 04/25/98 nbastin ** ** MathLib for PHP3 maintained by Nick Bastin <nbastin@rbbsystems.com> ** If you have source for functions that you would like to see added, or ** have functions that you would like to see added but don't know how to ** write yourself, please email me. ** ** All functions tested before distribution for functionality, and a ** reasonable bit of accuracy. However, these functions have ** not undergone extensive testing for their precision and accuracy, and ** you use at your own risk. ** ** That said, quite a few errors did turn up in testing, and I think I ** got them all. However, if you find an error, please let me know. ** ** To use these functions, include them in your PHP scripts ** ** - Nick Bastin <nbastin@rbbsystems.com> */ /* ** There's already a 'round' function in PHP...do we need this? ** Author: Bjorn Borud, Guardian Networks AS, <borud@guardian.no> */ function roundoff($v) { if ( $v - floor($v) >= 0.5) { return(ceil($v)); } else { return(floor($v)); } } /* ** Converts degrees to radians ** Author: Bjorn Borud, Guardian Networks AS, <borud@guardian.no> ** Modified to break reliance on PI variable by Nick Bastin, <nbastin@rbbsystems.com> */ function deg2rad($degrees) { return ((pi(void) * $degrees) / doubleval(180)); } /* ** Converts radians to degrees ** Author: Nick Bastin, RBB Systems, <nbastin@rbbsystems.com> */ function rad2deg($radians) { return (($radians * doubleval(180)) / pi(void)); } /* ** Base-$base logarithm of $val. Useful for those evaluating logarithms in non- standard bases ** Author: Nick Bastin, RBB Systems, <nbastin@rbbsystems.com> */ function baselog($base,$val) { return ((log10($val))/(log10($base))); } /* ** Factorial function (Be careful, this number can grow out of control very quickly) ** Since you can't perform a factorial of a non-integer, the function casts $number to an integer. ** Author: Nick Bastin, RBB Systems, <nbastin@rbbsystems.com> */ function factorial($number) { $a = $b = (int) $number; while ($b>1) { --$b; $a = $a * $b; } return $a; } /* ** Greatest Common Divisor function - Returns the greatest common divisor of $x and $y ** Author: Nick Bastin, RBB Systems, <nbastin@rbbsystems.com> */ function gcd($x,$y) { $x = abs($x); $y = abs($y); if ( $x + $y = 0 ) { return "ERROR"; } else { while ($x > 0) { $z = $x; $x = $y % $x; $y = $z; } return $z; } } /* ** Functions coming soon: ** ** - Infinitely precise division function ** - Factoring function ** - Prime number evaluation ** - Prime number generator */ ?> | ||||||||||
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