RDataTypeRegisteredQ[type]returns True if a data type with a given name has been registered in a current RLink session, and False otherwise.
Test if the data frame type has been registered:
Now unregister it and test again:
Reload type definitions to restore the data frame type registration:
RDataTypeRegister RDataTypeUnregister RTypeOfHighLevelExpression RTypeOfLowLevelExpression RDataTypeDefinitionsReload
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