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Function parameters, using : and ?


Hi!  Is there a way of using the default pattern(:) and the match(?)
pattern for the same argument in a function?  I'm interested in writting
something like this

   Func[x_List, y_List, epsilon_(?NumberQ):10^-6] := Module[{},...]

but I can't get it to work.  What is the problem? I must have tried all
the different combinations of the charaters _?: without success.  Any
suggestions?

- Ricardo Marimon
  rmarimon at leland.stanford.edu


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