And most of the time, a for/push combination converts very naturally to a map: 
my @sets;
for my $x (1..3){
  my @products = map { $x ** $_ } (1..3);
  push @sets, \@products;
}
use Data::Dumper;
print Dumper(\@sets);

[download]
Then we still have a for/push. Since we have to use $_ for our loop variable in map, it might seem a little tricky, but we're nesting these, so we can do this: 
my @sets = map {
  my $x = $_; # Copy outer loop variable
  my @products = map { $x ** $_ } (1..3);
  \@products;
} (1..3);

[download]
Of course, there's no real need for the @products array: 
my @sets = map {
  my $x = $_; # Copy outer loop variable
  [map { $x ** $_ } (1..3)];
} (1..3);

[download]
Caution: Contents may have been coded under pressure.

In reply to Re^2: Separating Compound Lists by Roy Johnson
in thread Seperating Compound Lists by dReKurCe

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