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

Or more simply as:

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

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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