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Re^2: Locating a specified number of contiguous 0 bits within a large bitstring efficiently.

by BrowserUk (Pope)
on Jun 07, 2013 at 06:04 UTC ( #1037589=note: print w/ replies, xml ) Need Help??


in reply to Re: Locating a specified number of contiguous 0 bits within a large bitstring efficiently.
in thread Locating a specified number of contiguous 0 bits within a large bitstring efficiently.

This works perfectly, and fairly quickly. Thankyou.


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Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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Comment on Re^2: Locating a specified number of contiguous 0 bits within a large bitstring efficiently.
Re^3: Locating a specified number of contiguous 0 bits within a large bitstring efficiently.
by wrog (Monk) on Jun 07, 2013 at 08:25 UTC
    I don't see how this can work for $N<8; in fact, it doesn't:
    match_0s(1,"\201\201\201\201") => -1

      Oops, thanks for catching that.

      I edited my previous post.

      Indeed. My benchmark code was using a random generator that was not producing values < 8. Now fixed. Thanks.


      With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
      Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
      "Science is about questioning the status quo. Questioning authority".
      In the absence of evidence, opinion is indistinguishable from prejudice.

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