Create a round robin database for a series of numeric data collected at regular time intervals
create_db(fn, tz_step, n, m, tz_origin = 0, size = 8)file name
step of time series data in seconds
number of steps to store
number of data points at each time step
origin of time steps in seconds
size in bits of the written numeric data
invisible(TRUE) but called for the bi-product of creating the file
The value tz_origin can be though off as the offset from 1970-01-01 00:00:00 (0 epoch time) of the closest observation time e.g is observations were record hourly at 5 minutes past the hour tz_step=3600 and tz_origin = 300