Should be something like
sub p
{
my @args = @_; # for clarity, more efficient not to copy
# initializing this handles the zero argument case
my $result = 0;
$result += ($args[$_] - ($_ ? $args[$_-1] : 0))
* p(@args[0..($_-1)],@args[($_+1)..(@args-1)])
foreach(0..(@args-1));
return $result;
}
note: untested
Ron Steinke
rsteinke@w-link.net
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