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You've failed again to ask your question appropriately.

First the diagnoses:

($sub1, $sub2, $sub3) = split (/\_/, @array,3);
split doesn't work on an array!!!
while my $elem (@array) { ($sub1,$sub2,$sub3) = split(/_/, $elem, 3); # do something here... }
Now you might have something in $sub3, but this doesn't make any sense either:
$sub3 = sort { $b <=> $a } $sub3;
You can't sort a scalar (well, it doesn't do anything interesting)

Seems what you really want to do is sort the elements of @array by the last field (numerically), in which case you'll need something like this:

my @a2; while my $elem (@array) { my @fields = split(/_/, $elem, 3); push @a2, \@fields; } my @a3 = sort { $b->[2] <=> $a->[2]} @a2;
But you should really see How (Not) to Ask a Question.

Quantum Mechanics: The dreams stuff is made of

In reply to Re^2: Sort - can't by QM
in thread Sort - can't by malaga

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