r_data:r_data

Create an R data.frame from the solutions of Goal. The resulting data frame is bound to the R variable Rvar. For example:

?- r_data_frame(movieyear,
                [movie=Name, year=Year],
                movie(Name, Year)).

Arguments:

`Rvar`	- is the name of the R output variable
`Columns`	- is a list Name=Var