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  1. PREVAL is an essential function to describe processes on a time axis in the form of differential schemes.
  2. If the indicated case number is less than 1, the value of case 1 is taken. In case a previous value is not available, the Modeller will go back to that case and will attempt to derive the value by placing it in the goal list. Under normal circumstances this will be a PENDING starting a PENDING starting value. 
  3. Important: Case_Par should be a parameter and no value or any other numeric expression.

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will return the value for A in case number 6 (9-3=6)

 

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