use mapcar;

my @matrix = (
   [ qw(ab cd ef gh)],
   [ qw(ij kl mn op)],
   [ qw(qr st uv wx)]
);

my @transposed = mapcar {[@_]} @matrix;

print join( "  ", @$_), $/ for @transposed;

__END__
ab  ij  qr
cd  kl  st
ef  mn  uv
gh  op  wx