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);
count_prime_factors
Return the count of prime factors of a number. This is the number of
values returned by "prime_factors()".
my $count = count_prime_factors($number);
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effect as it has been superseded by "skip_multiples".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