[Rd] Lost in S4 and S3 classes

From: Davide Rambaldi <davide.rambaldi_at_ieo.eu>
Date: Wed, 12 Dec 2012 14:51:33 +0100

Hi all, this is my first post in R devel… sorry if I lost some of the guidelines.

Anyway this is my problem:


R version 2.15.2 (2012-10-26)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

I want to make an S4 class that use the output object of the function of nls.lm as a slot:


setClass (

      lmOutput = "nls.lm",
      anumeric = "numeric"


Now, if I want to call this class in a "constructor function" I can do something like this (correct?):

myConstructor <- function()

pippo <- myConstructor()

> pippo

An object of class "TestClass"
Slot "lmOutput":
<S4 Type Object>
[1] "nls.lm"

Slot "anumeric":

And the object "pippo" seems correctly initialized.

If I use this code instead I got an error:

myConstructor2 <- function()
  pippo <- new("TestClass", anumeric=1000)   return(pippo)

> pippo <- myConstructor2()

Error in validObject(.Object) :
  invalid class “TestClass” object: invalid object for slot "lmOutput" in class "TestClass": got class "S4", should be or extend class "nls.lm"

Seems that if I want to INIT in new some slots, this create problem with a S3 Class slot?

Any clue on how to avoid this problem?



Davide Rambaldi, Bioinformatics PhD.

IEO ~ MolMed
[e] davide.rambaldi_at_ieo.eu
[e] davide.rambaldi_at_gmail.com

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