I appreciate that the numerical evaluation of the error function is 
implemented. However, there is seems to some missing link to simply draw the 
function

(9) -> erf 2.0

   (9)  0.9953222650_1895273416_206925637
                                                                  Type: Float
(10) -> draw(erf x, x=0..3)
   Compiling function %B with type DoubleFloat -> DoubleFloat
   Conversion failed in the compiled user function %B .

   Cannot convert from type Expression(DoubleFloat) to DoubleFloat for
      value
   erf(0.0625)

I would appreciate if this could be fixed


Mit freundlichen Grüßen

Johannes Grabmeier

Prof. Dr. Johannes Grabmeier
Köckstraße 1, D-94469 Deggendorf
Tel. +49-(0)-991-2979584, Tel. +49-(0)-151-681-70756
Tel. +49-(0)-991-3615-141 (d),  Fax: +49-(0)-3224-192688

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