For those who felt a sinking feeling in the pit of the stomach when they saw the expression
log_{2}4096, here is a quick review. For example, in the shocked movie above,
if you change the input to 4096, then your output should be 12.0.
So play around. What's the output if the input is 32? 8? 2? 1?

How to compute:
log_{2} X =
(ln X)/(ln 2),
where "ln" is the
natural log function.
Find it on your
Calculator.



Each of those inputs is a perfect power of 2, so the answers are nice integers.
For a number like 20^{3} = 8000, the ouput is not a perfect integer.
(Note: I use 20 here since that is the number of amino acids, so numbers like 20^{3}
will be important in what follows.) (Also note: log_{2}(0) = infinity,
which is denoted "inf" above.)
