G'day snape,
Given this extract from your posted code:
print $col,"\n"; ## string of all the columns I am interested in
...
@line = @line[$col]; ## I am getting the error since,
# $line is a string and not numeric..
# It works if you do
# @line[1,2,5,6,70,71,75,100,112,114]
I suspect you haven't fully understood array slices.
They're explained in perldata: Slices.
This piece of code (which borrows from your variable names), should explain what I think you need:
#!/usr/bin/env perl -l
use strict;
use warnings;
my @line = qw{A B C D};
print "All line elements: @line";
my $col = '2,3';
print "Indices I want: $col";
my @indices = split /,/ => $col;
my @wanted_elements = @line[@indices];
print "Wanted elements: @wanted_elements";
Output:
All line elements: A B C D
Indices I want: 2,3
Wanted elements: C D
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