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rreference-class

unused argument error when printing from RC class method

I am creating an RC class and while trying to print(.self$something) within a class method I am getting:

Error in print(.self$something) : unused argument (.self$something)

I am sort of new to R, so am I missing something here? This is for an assignment which asks us to use RC classes, using R6 is not an option.

myclass <- setRefClass("myclass",

      fields = list (
        formula = "formula",
        data = "data.frame", 
        something = "numeric"
      ), 

      methods = list (

          initialize = function(formula, data) {
              ...
          },

          print = function() {
            ...
            print(.self$something)

          },
      )
)

a <- myclass$new(formula,data)
a$print()
> Error in print(.self$something) : unused argument (.self$something)

Edit: Extra info, if I try a$something I get what I should get.

Solution

  • As @Mohammed mentions, this happened because I was in printing within my own print environment. Though cat() could be an option, later I faced other issues in which cat did not print the object (that could be a thread on its own so I will not go deeper on that here).

    What I ended up doing was calling the print function for that specific data type. For instance, if something was a data.frame I called print.data.frame(.self$something) and worked as expected.