Subject:
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Bitstring vector to list conversion in Perl5
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Newsgroups:
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lugnet.off-topic.geek
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Date:
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Wed, 3 Jan 2001 17:45:17 GMT
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Viewed:
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79 times
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Anyone know of a super-efficient way in Perl5 to convert a sparse bitstring
vector to a list of integer-offset values (just the 1-bits) in Perl5?
That is, if you had some $v that was created like so:
my $v;
my @n = (...some sorted sparse list of positive integer values...);
foreach (@n) { vec($v,$_,1) = 1; }
then what's the fastest way to regenerate @n later given $v ? Bitstring
vectors can be |'d, &'d, and ^'d super-efficiently in Perl5, but I don't know
the most efficient way to treat them as sparse lists -- i.e., looping over
just the bits that are set and ignoring the bits that aren't set.
--Todd
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