Cool! I just made a program way way way faster! This is FPC, specifially reading in a .fpc database with markers in it. It used to take a hour and a half to read in a database on a Sun, and 20 minutes on a 1GHz AMD-K6. Now it takes about 1 minute! I've been working on this for the past three days, the first day was just getting my bearings, yesterday I tried another approach that still did the adding in O(N^2), even though I thought it would be lots faster, it wasn't, and I was sad. Last night, I must have figured it out in my dream, cos' when I woke up, I knew the answer. It only took the morning to do the code, and now it's O(N) and way faster. Cool!