Method neg

recipes/Python/59884_RPN_Stack_class/recipe-59884.py:183–185

(self)

                self.pop(2); self.push(newx)
               
        def neg(self):  #negate
                newx = -self.getx()
                self.pop(); self.push(newx)
               
        def sin(self):
                newx = math.sin(self.getx())