It seems you have some solutions, so I'm taking a different tack. Two points:
1) You'd probably benefit more from showing us a little code with your question, before seeing the solutions.
2) You may want to look at Memoize, like so:
use Memoize;
# make sure memoize happens before p is called
BEGIN { memoize('p'); }
Or, cache it yourself:
{ # closure for sub p
my %seen;
sub p
{
my $arg_string = join '^', @_;
return $seen{$arg_string} if exists $seen{$arg_string};
# compute $result here as usual
# ...
return $seen{$arg_string} = $result;
} # end sub p
} # end closure for sub p
I leave it to you to work out how to handle the empty parameter list :)
Update: See BrowserUk's Re^2: recursive formula. below for reasons why this isn't a good idea.
-QM
--
Quantum Mechanics: The dreams stuff is made of
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