Cascade Historian™ : Version 5.4
	Commands

`length`

length — finds the total number of values in a history.

Syntax

(length history [start [end]])

history: The name of a history defined by the history command.
start: Optional, the start of a desired time range in seconds, expressed as a real number. The default is the first value available.
end: 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.

[sh]$ lsend Hist
Hist> (length p3)
(length p3 2853)
Hist> (length p3 973632000.500 973636000.500)
(length p3 11)
Hist>


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