Aside from the modules and the compact solutions,
I'll try a non-obfuscated solution first ;-) This will
work on any 'text-matrix' as far as it's rectangular ...

my $inp='
1 2 3
4 5 6
a b c
x y z
';
my @data;

 my @elem = grep length, split /\s+/, $inp;
 my $rows = () = $inp =~/(?<=^)\w/msg;
 my $cols = @elem / $rows;
 for my $col (0..$cols-1) {
    push @data, [ map $elem[$col + $cols*$_], 0..$rows-1 ]   
 }

 # print the matrix
 print "@$_\n" for @data;
[download]

Regards

mwa

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