Don McClaren wrote:
>
> ...however, the author doesn't include an ln() function in his
> math library.

Check out

http://www.interstice.com/~sdattalo/technical/software/pic/piclog.html

for a fast 8-bit logarithm program. However, it's a fixed point
implementation not a floating point one.

However, if you want to write a floating point version then you
might want to check out:

http://www.interstice.com/~sdattalo/technical/theory/logs.html

Scott