Simple SQL update

I'm trying to do an update in Oracle 9i that seems like it should be very simple but I can't figure out the syntax. The update needs to use a different formula Dependant on the current value of the attribute.

Simplified:

UPDATE MyTable Set F1 = (F1 > 1) * 2 + 1 ;

This returns a missing right parenthesis error.

As does

Select (2>1) FROM dual ;

How do I put the comparison into the calculation?

-- 
Randy Harris
tech at promail dot com
I'm pretty sure I know everything that I can remember.