Dafydd Hughes wrote:

Hi Folks

Sorry to be asking aquestion which I expect could be solved easily if only I remembered more math from high school (I'm working on that...)

a really good ressource for maths is: http://mathworld.wolfram.com

while they cover a lot oh highlevel maths, you will also get explanations for simpler problems

The log object in pd seems to only give the natural logarithm, but I desperately need the base 2 logarithm. Is there an object I don't know about or a way of translating from one to the other?

log_a (x) = log_b (x) / log_b (a)

in your case:

ld(x) = ln(x)/ln(2)

mfg.asd.r IOhannes