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my $bitvec = pack "H*", ($string =~ tr/AGCT/1248/r);
my @arrr = split //, unpack "B*", $bitvec; my $histogram = Math::GSL::Vector->new(); ... # normalize and uninterleave $histogram *= 1 / $sum_freq; @parts = part { $i++ % 4 } $histogram->as_list;