.. py:function:: create_fby(flows, delay, inits)

   
   Return the expression tree for the init operator.


   :Parameters:

       **flows** : :obj:`Union`\[:obj:`EX`, :obj:`List`\[:obj:`EX`]]
           Input flows.

       **delay** : :obj:`EX`
           Delay of the operator.

       **inits** : :obj:`Union`\[:obj:`EX`, :obj:`List`\[:obj:`EX`]]
           Initial values.

   :Returns:

       :obj:`ET`
           ..








   .. rubric:: Notes

   This is an interface change with respect to the *SCADE Creation Library*.
   The flows and their initial values are now specified in two separate lists.





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