I know this is super ugly, though working.
@a = qw/2 2 2 5/;
#@a = qw/3 3 3 2 2 2 4 4 4/;
$n = 4;

powMatrix(\@a, $n);

sub powMatrix {
    $m = shift;
    @f = @$m;
    $i = shift;
    $l = sqrt(@$m);
    while(--$i){
        for($k = 0; $k < @$m; $k+=$l){        
            for($c = 0; $c < $l; $c++){
            $o = $c; $z = 0;
                for($b = $k; $b < $k+$l; $b++){
                $z += $f[$b] * $m->[$o];
                $o += $l;    
                }
            push (@g, $z);
            }
        }
    @f = @g; @g = ();
    }
    print "@f\n";
}

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In reply to Re: Multiplying matrices by Lennotoecom
in thread Multiplying matrices by madM

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