====Methods (GetHistory)====

When requesting history from ARDI, there are two key parameters that control the output.

The first is the [[grain|Grain]], which dictates the resolution of the data.

The other is the **mode**, which is used to change how the query works.

Note that [[discrete_data|discrete data doesn't obey the query mode]].

The following are valid values for mode...

===interp===

This is the default mode for a history request. It means 'interpolated', which usually means that the value is the **average across the time frame**.

If you're asking for 600 samples of data across one hour of time, this will give you buckets of 10-second data, with each bucket containing the //average// of the values during that time.

===min===

This works like the query above, but each time window contains the **minimum** value seen during that time.

===max===

Like the min function, but each time window contains the **maximum** value seen during that time.

===raw===

This tells ARDI to retrieve the unfiltered, raw data from the data source. In this case, the **grain** parameter will be ignored.