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Perl: the Markov chain saw

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Let's assume you have split out the 4 elements as variables $id1, $id2, $sequence, $label. The next thing you need to create is the signature that represents a "unique" value, by combining $id2 and $sequence: simplest is if you can join them with some character known not to appear in either value - from the example above I will guess that the pipe character '|' is safe to use:

my $signature = join '|', $id2, $sequence;

Now you can use this signature as the key in a hash. For simplicity, I'll use this to store the entire structure:

my %hash; # somewhere before you start to loop over the data ... # within the loop over your data my $signature = join '|', $id2, $sequence; my $structure = { id1 => $id1, id2 => $id2, sequence => $sequence, label => $label, }; $hash{$signature} = $structure; # save it

In the case of duplicate signatures this overwrites, so ends up saving a structure for the last example of any given signature, but there are other strategies possible.

You can then emit the data by looping over the hash something like:

for my $signature (keys %hash) { my $structure = $hash{$signature}; printf "%s|%s\n%s\n%s\n", $structure->{id1}, $structure->{id2}, $structure->{sequence}, $structure->{label}; }

In reply to Re: How to make unique entries by hv
in thread How to make unique entries by Anonymous Monk

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