Call function from "views"

[eluser]Mareshal[/eluser]
I am new in CodeIgniter, only a few days, but I already started to like it very much.

Here is my problem. How do i call a function without URL parameters ?

Let's say I have this:

Controller:

Code:

class Main extends Controller{    
    function diff($n1, $n2){
            $diff['res'] = $n1 - $n2;
        $this->load->view('main_diff', $diff);
    }
}

How do I call function diff from main_diff(view/main_diff.php) without this url: http://localhost/main/diff/12/24 and without $this->uri->segment(3) ?