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%PrevV function


Function
The function returns previous value of the argument. Function usefulness - eval tags.
Declaration
UNIVAL  %PrevV(
   UNIVAL in Arg
 )

Parameters
Arg Expression of optional type.

Note
Based on the way of evaluation of eval tag the result will be:
  • periodical eval tag - returns the value of argument valid during previous calculation,
  • on-change eval tag - returns previous value of the argument.

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