POLYFLOW - Create a UDF of evolution parameter (S) or time

How to create a UDF for describing a boundary condition dependent on the evolution parameter (S) or time ?
In the appropriate menu, click on EVOL:
select the item User Defined Function, and enter an ID as appropriate, and pursue the session
Edit a file containing the UDF. The contents may look like:
(deffunction UDF1 (?S)
(bind ?condition (** 10. ?S))
The name following the instruction "deffunction" must contain UDF and the ID specified in the POLYDATA session. In the present example, the UDF defines the function 10^S or 10^t.
See also chapter 28 of the POLYFLOW User's manual and the example 60.

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