my $header_row= 'one two three four five';
...
my %name2Index;
...
my $col=0;   
foreach my $col_head (split ' ',$header_row)
{
   $name2Index{$col_head} = $col++;
}

[download]

Or more simply as: 

my @header_row = qw/ one two three four five /;
...
my %name2Index;
...
@name2Index{ @header_row } = 0 .. $#header_row;

[download]

In reply to Re^4: making presence/absence table from a hash of arrays by jwkrahn
in thread making presence/absence table from a hash of arrays by reubs85

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