Re^2: How to make a hash to evaluate columns between large datasets

Hi Thelonius. I would need to compare four keys in in the reference, and if those four match, return only an additional key which is the final column.

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Re^3: How to make a hash to evaluate columns between large datasets by TheloniusMonk (Sexton) on Aug 23, 2018 at 13:32 UTC
In this case you just need to put the reference information in a hash from the reference file and use that for look up instead of an array. A hash has the syntax `my %hashname = (); # init empty hash $hashname{key1} = "value1"; $hashname{key2} = { x => 'y' }; # nests an anonymous hash as the value + for key2` [download] often you want to store a hash reference in a scalar to avoid referring to the entire hash, e.g. :- `my $href = \%hash;` [download] hope this helps	[reply] [d/l] [select]

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Re^3: How to make a hash to evaluate columns between large datasets
by TheloniusMonk (Sexton) on Aug 23, 2018 at 13:32 UTC

my %hashname = (); # init empty hash
$hashname{key1} = "value1";
$hashname{key2} = { x => 'y' }; # nests an anonymous hash as the value
+ for key2
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my $href = \%hash;
[download]

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