A pugs version of transpose..

use v6;

my $matrix = [
 [85,34,15,38,53,80],
 [73,38,31,92,17,96],
 [89,10,31,96,35,60],
 [45,68,23,90,33,12],
 [99,100,27,52,25,28],
 [85,50,75,28,73,4],
 [45,8,45,48,55,66],
 [57,10,5,4,43,20],
 [61,36,1,22,7,74],
 [37,16,71,32,81,42],
 ];
 
 
sub print_matrix ($matrix) {
   for ($matrix) -> $row {
      say $row.join(" ");
   }
}

sub transpose ($matrix) {
 my $new_matrix;
 my $width  = $matrix[0].elems - 1;
 my $height = $matrix.elems - 1;
 for (0 .. $width) -> $y {
     for (0 .. $height) -> $x {
      $new_matrix[$y][$x] = $matrix[$x][$y];
     }
 }
 return $new_matrix;

} 

say "before";
print_matrix($matrix);
say "after";
print_matrix( transpose $matrix );
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