[drraw-users] Begginer question: how to combine two rrd files?

[David Nolan]

On 10/3/06, Tony T. <rollthebones at gmail.com> wrote:

> Thanks again, I am reading up on the rrdtool site and trying to understand
> all this RPN stuff...I am sure there must be a logical reason for what looks
> to me like a very odd way to handle logic.  :)

RPN, Reverse Polish Notation, is a way of expressing mathmatics that
removes the need for complex grouping logic and parenthesis.  From a
programming point of view its a stack based language, which means that
3,4,+ is parsed as "I have a 3, I have a 4, I add my two most recent
numbers".  At that level it seems trivial, but a computer can parse a
complex RPN expression much more easily then it can parse a complex
"normal" math expression.  Of course wikipedia can explain it better
then I can...  http://en.wikipedia.org/wiki/Reverse_Polish_notation

-David