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Re^4: Hamming Distance Between 2 Strings - Fast(est) Way?

by Roy Johnson (Monsignor)
on Oct 14, 2005 at 19:12 UTC ( #500354=note: print w/replies, xml ) Need Help??

in reply to Re^3:Hamming Distance Between 2 Strings - Fast(est) Way?
in thread Hamming Distance Between 2 Strings - Fast(est) Way?

If I were writing it from scratch, I'd name things differently. I used the names the OP did, so that he could see the correspondence. I added a parenthetical explanation to my original post to make that clear.

I wasn't going to make a new reply, but I had to correct your mistaken notion that tr deletes things when it doesn't have the /d option appended.

Caution: Contents may have been coded under pressure.

Replies are listed 'Best First'.
Re^5: Hamming Distance Between 2 Strings - Fast(est) Way? (Ah! But!)
by BrowserUk (Pope) on Oct 14, 2005 at 21:04 UTC

    Of course you are right, nothing is deleted without /d.

    However, the "count the stars" mode does seem to be consistantly around 10% quicker?

    $s = "\0\1" x 10000;; cmpthese -1, { A=> q[ $n1 = $s =~ tr[\0][\0] ], B=> q[ $n2 = $s =~ tr[\0][]c ] }; Rate B A B 23522/s -- -9% A 25935/s 10% -- print "$n1 : $n2";; 10000 : 10000

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