2eclock

but i´m getting the message "obj or direct. expected but float function 'clock' found instead".

Can someone give to me some way to do this?
 

"exp(A): Exponential of A. Returns the value of e raised to the power A where e is the base of the natural logarithm, i.e. the non-repeating value approximately equal to 2.71828182846."

So what you want is 2 * exp(clock)