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YAL038W 1.1 2.4 4.1 YCL040W 1.1 1.6 1.8 9.11 0.0402128119838095
%hash = ('YAL038W' => [1.1, 2.4, 4.1], 'YCL040W' => [1.1, 1.6, 1.8, 9.11, 0.0402128119838095], ...);
my $cur_identifier = ''; chomp $line; ... push @{$hash{$cur_identifier}}, $element; } }