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Re^2: Algorithm for cancelling common factors between two lists of multiplicands

by BrowserUk (Pope)
on Aug 08, 2005 at 19:50 UTC ( #481995=note: print w/replies, xml ) Need Help??


in reply to Re: Algorithm for cancelling common factors between two lists of multiplicands
in thread Algorithm for cancelling common factors between two lists of multiplicands

Please look again. This is not the elimination of duplicates.


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Re^3: Algorithm for cancelling common factors between two lists of multiplicands
by ikegami (Pope) on Aug 08, 2005 at 19:55 UTC
    oops, you're right. I can't figure out what the pattern is. What does he mean by "canceling out"?

    Update: Here's a solution:

    use Math::BigInt (); use Math::Big::Factors (); my $a = Math::BigInt->new(1); $a *= $_ foreach @a; # 17820000 my $b = Math::BigInt->new(1); $b *= $_ foreach @b; # 19872000 my $gcd = Math::BigInt::bgcd($a, $b); # 108000 my $c = $a / $gcd; # 165 my $d = $b / $gcd; # 184 my @c = Math::Big::Factors::factors_wheel($c); # 3, 5, 11 my @d = Math::Big::Factors::factors_wheel($d); # 2, 2, 2, 23

    Not quite the solution you asked for. Close enough?

Re^3: Algorithm for cancelling common factors between two lists of multiplicands
by xdg (Monsignor) on Aug 08, 2005 at 20:05 UTC

    Is this a factoring problem? Math::Factor and Math::Big::Factors may have useful routines. In particular Math::Factor has the subroutine "match" that sounds something like what you're trying to do, though as others have stated, it's still not clear what exactly that is.

    -xdg

    Code written by xdg and posted on PerlMonks is public domain. It is provided as is with no warranties, express or implied, of any kind. Posted code may not have been tested. Use of posted code is at your own risk.

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