🚀 go-pugleaf

In article <1hqp39INNilh@shelley.u.washington.edu>, monaghan@cac.washington.edu (Tracy Monaghan ) writes:
|> 
|> Thanks for the formula for estimating GNUchess strength, but...
|> 
|> For those of us who are mathematically-deficient, is there a formula
|> which doesn't use log2 but makes use of log10, or ln (natural log), or
|> barring that, some fanciful way of achieving log2 using log10 and/or ln?
|> 
|> Or, if someone just happens to know the estimated rating of GNUchess 4pl60
|> on a DECstation 3100...

The conversion is available in a lot of mathematics books.  If memory serves,
converting works as follows:

     x = log to base 2 of (some expression or other).

    x*ln(2)/ln(10) produces the value of x as a base 10 logarithm.    

    If y is not "logged" yet.  That is:

     y  =  (some expression or other)

    then the base 10 logarithm is it is ln(y)/ln(10)

where "ln(z)" is the natural log of z.


Anyway, that's what MS DOS basic shows me.

-- 
   Larry W. Loen        |  My Opinions are decidedly my own, so please
                        |  do not attribute them to my employer