the error is highest when the represented number is pow(2,n)-1 and lowest (zero) when the represented number is pow(2,n)
funny thing isn't it? this makes for a fast (if a little inaccurate) base2 logarithmic calculation, ADD. Changing the base to a known number only takes an additional DIVIDE.
error (top is 0.1, numbers range from 1 through 10240)
![Image](http://img386.imageshack.us/img386/9373/errorgt2.png)
probably only for positive numbers