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Re^3: Hamming Sequences and Lazy Lists

by Roy Johnson (Monsignor)
on Mar 17, 2005 at 18:40 UTC ( #440477=note: print w/ replies, xml ) Need Help??

in reply to Re^2: Hamming Sequences and Lazy Lists
in thread Hamming Sequences and Lazy Lists

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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