comment on

It doesn't produce the output you wanted ...

As I mentioned in 482012, the exact reduction isn't important. The results of your 3 manual steps (33,5)(2,4,23) and my 5 manual steps (33,5)(8,23) are completely equivalent.

Adding a dependancy upon Inline::C is heavier than Math::Pari, though GCD could be written in perl of course.

Your algorithm certainly works. However, using GCD requires multiple, O(m*n) passes over the datasets. hv's prime factors approach eliminates the multiple passes and seems, on the small sets I've tried, to get the results more quickly, even with pure perl factoring code.

Coming up with an efficient, pure perl implementation of prime factorisation (limiting myself to integers 0 .. 2**32 ) is my current fun challenge :)

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?

"Science is about questioning the status quo. Questioning authority".

The "good enough" maybe good enough for the now, and perfection maybe unobtainable, but that should not preclude us from striving for perfection, when time, circumstance or desire allow.

In reply to Re^2: Algorithm for cancelling common factors between two lists of multiplicands by BrowserUk
in thread Algorithm for cancelling common factors between two lists of multiplicands by BrowserUk

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