(length history [start [end]])
The name of a history defined by the history command.
Optional, the start of a desired time range in seconds, expressed as a real number. The default is the first value available.
Optional, the end of a desired time range in seconds, expressed as a real number. The default is the last value available.
An integer number of values in the history between the specified start and end times, in this format:
(length history length)
on success, otherwise:
(error "History history does not exist")
This command queries the history for the total number of values available.
This command corresponds to the Cogent C API function HI_Length and the hist_length dynamic library function.
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