One way is to collect the rs things in an array (@samples) and the AW things in a hash-of-arrays inside your nested for-loops, then print it all out after the loops. UNTESTED: 
my @samples;
my %aws;

foreach my $geno( @ {$genotype} ){
  push @samples, $geno->[4];
  if(defined $geno->[3]){
    push @{ $aws{$geno->[1]} }, $geno->[3];

  }#end of if loop to check the genotype defined
  else{
    push @{ $aws{$geno->[1]} }, 'NO';

  }

}#end of @$genotype


print 'Sample,';
print(join ',', @samples);
print "\n";
for (keys %aws) {
    print "$_,";
    print(join ',', @{ $aws{$_} });
    print "\n";
}

[download]

In reply to Re: Changing the format of output by toolic
in thread Changing the format of output by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.