====== LASTVAL Function ======


  * LASTVAL( <value>, <periods> )
Returns the nearest non-Nil value over the last number of periods for the current data point.

This method looks back up to the specified number of periods and returns the first non-NIL value it finds.

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<datatables>
^ Function Parameters^^
^ Parameter ^ Description ^
|<value>|The value to look for.|
|<periods>|The maximum number of periods to look back.|
</datatables>

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