Hi all,

  I am developing a processing model and in one of steps I would need
to compute new values for an attribute in a layer.   I need to compute
the new attribute value as (e.g.) $rownum plus a given value.   I don't
know how to represent this external value in calculator setup.

  Is there a way to define this like a variable?    Or is there a way
to do it with another approach?


  TIA



  Roxo

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