In this paper, we describe our approach to the Quantum Physics classification problem posed in KDD Cup 2004. We used our FIRMplus recursive partitioning random tree approach to classify the two particle types. We spent almost no time tuning parameters, which made our 3<sup>rd</sup> place finish somewhat surprising.
It is a well known fact that passing objects <i>into</i> functions by reference (in C++) is more efficient than passing by value. Passing objects, created within functions, <i>out of</i> functions by reference could also be more efficient if it wasn't sure to cause memory-leak in the system. Programmers therefore resort to "pass-by-reference,… (More)