I'm going to start by coding the original Darvas box. It might generate some insight into Zeev boxes. Do you know if Zeev's reference to a step function was figurative as in stair steps or if it's a math function?
but I dont think it works that well. I like the box idea because of the forced time frame calculation.
ps I only pulled another 50 cents out of NOK between 146 and 167 kroner although I bought at the exact box bottom, I chickened out to "lock in a profit". If you actually had discipline you would not chicken out until your stops set by the actual trading range were hit