By math solution, I'm talking about something that simply needs a math equation to solve the problem. Something along the lines of "IF (T1-T0) MOD 900" or something like that. Something that doesn't require iterating through a list for each time stamp. I don't know if that's possible.
Unless I'm misunderstanding either your problem or their solution, the Shonky/tonyc algorithm makes just one pass through the file and uses only scalars (not arrays or lists) as local variables. You aren't going to improve on that.
Peter
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