NAME Math::Factor::XS - Factorize numbers and calculate matching multiplications SYNOPSIS use Math::Factor::XS ':all'; # or use Math::Factor::XS qw(factors prime_factors matches); $number = 30107; @factors = factors($number); @primes = prime_factors($number); @matches = matches($number, \@factors); print "$factors[1]\n"; print "$number == $matches[0][0] * $matches[0][1]\n"; DESCRIPTION "Math::Factor::XS" factorizes numbers by applying trial divisions. FUNCTIONS factors Find all factors (ie. divisors) of a number. @factors = factors($number); The number is factorized and its factors are returned as a list. For example, @factors = factors(30); # @factors = (2, 3, 5, 6, 10, 15); prime_factors Find prime factors of a number. @factors = prime_factors($number); The number is factorized and its prime factors are returned as a list. Multiplying the list together gives $number. For example, @primes = prime_factors(90); # @primes = (2, 3, 3, 5); matches Calculates matching multiplications. @matches = matches($number, \@factors, { skip_multiples => [0|1] }); The factors will be multiplied against each other and all combinations that equal the number itself will be returned as a two-dimensional list. The matches are accessible through the indexes; for example, the first two numbers that matched the number may be accessed by $matches[0][0] and $matches[0][1], the second pair by $matches[1][0] and $matches[1][1], and so on. The hashref provided at the end is optional. If "skip_multiples" is set to a true value, then matching multiplications that contain multiplicated small factors will be discarded. Example: 11 * 2737 == 30107 # accepted 77 * 391 == 30107 # discarded Direct use of $Math::Factor::XS::Skip_multiple does no longer have an effect as it has been superseded by "skip_multiples". EXPORT Functions "factors()", "matches()" and "prime_factors()" are exportable. Tags ":all - *()" AUTHOR Steven Schubiger LICENSE This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself. See