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Re^2: Hamming Sequences and Lazy Lists

by tall_man (Parson)
on Mar 17, 2005 at 18:25 UTC ( #440473=note: print w/replies, xml ) Need Help??

in reply to Re: Hamming Sequences and Lazy Lists
in thread Hamming Sequences and Lazy Lists

The number 1 = 2**0 * 3**0 * 5**0, so it is a legitimate part of the series, not just a seed to be stripped off. It is part of the answer produced by the Haskell genHam above. Otherwise, your generator looks great and the output checks with the Haskell one.

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Re^3: Hamming Sequences and Lazy Lists
by Roy Johnson (Monsignor) on Mar 17, 2005 at 18:40 UTC
    Ok, well here it is, corrected for that, and without using coderefs for streams. I realized there really wasn't much point to that. All I really need to know is what my multiplier is, and which element of the output stream I'm looking at.
    use strict; use warnings; sub lazy_ham { my ($how_many) = @_; my @output_stream = (1); my @streams = map [$_,0], (2, 3, 5); for (@output_stream+1..$how_many) { # Find the lowest next item in the available streams my @peeks = map {$output_stream[$_->[1]] * $_->[0]} @streams; my ($lowest) = sort {$a <=> $b} @peeks; $peeks[$_] == $lowest and $streams[$_][1]++ for 0..$#streams; push(@output_stream, $lowest); } @output_stream; } print join(', ', lazy_ham(80)), "\n";

    Caution: Contents may have been coded under pressure.

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