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R-Extension: "R Script" operator changes ExampleSet values
When I view the Result ExampleSet (coming out of the R Script Operator), I discover that certain missing values in my input ExampleSet have been replaced with some undesired values. This has happened with two attributes: one of the type "text", and one of the type "date". In both cases, these attribute fields have also been re-designated as "nominal" in the output ExampleSet.
So the R Script Operator has re-designated some of my attributes to "nominal" and arbitrarily replaced missing values with other data. Neither of these actions were intended by me.
Is this a (serious) bug or should I have expected this behavior? Is there a way to control how the R Script operator treats its input ExampleSet?
I am using Rapidminer Studio 6.0 Professional.