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Questions tagged [r-s4]

One of the methods of object oriented programming in the R language.

647 questions
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Formatting and manipulating a plot from the R package "hexbin"

I generate a plot using the package hexbin: # install.packages("hexbin", dependencies=T) library(hexbin) set.seed(1234) x <- rnorm(1e6) y <- rnorm(1e6) hbin <- hexbin( x = x , y = y , xbin = 50 , xlab = expression(alpha) , ylab =…
R_User
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Reference Classes, tab completion and forced method definition

I am currently writing a package using reference classes. I have come across an issue which from reading various sources: Method initialisation in R reference classes Can't reliably use RefClass methods in Snowfall I gather is caused because…
jdharrison
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S3 style dispatching for S3 objects using formal method definitions

Related to this question, but slightly different and hopefully more clear. I am looking for a clean way to formally register methods for both S4 and S3 classes, but without relying on the terrible S3-dot-naming-scheme for dispatching. An…
Jeroen Ooms
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Useful book(s) on learning Object Oriented Programming in R?

I was reading an interesting post on R-bloggers on ''Object Oriented Programming in R using S4 Classes". The book "Statistics and Computing" written by Venables and Ripley has some chapters introducing S3 classes and S4 classes in S and R and have…
Sam
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Example of Using an S3 Class in a S4 Object

I want to include an RODBC connection as part of S4 object. It looks like RODBC is S3. For example: setClass( Class="Node", representation=representation( nodeName = "character", connection = "RODBC" ) ) Throws…
Kyle Brandt
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How to get the list of class that have a common S4 superclass in R

In R, how do I get the list of subclass of a S4 superclass? I found showClass("mySuperClass",complete=FALSE) but it only prints the result. I would like to store it in a vector to use it.
RockScience
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Efficient way to define a class with multiple, optionally-empty slots in S4 of R?

I am building a package to handle data that arrives with up to 4 different types. Each of these types is a legitimate class in the form of a matrix, data.frame or tree. Depending on the way the data is processed and other experimental factors, some…
Paul 'Joey' McMurdie
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S4 constructors and prototypes

Looking through Hadley Wickham's S4 wiki: https://github.com/hadley/devtools/wiki/S4 setClass("Person", representation(name = "character", age = "numeric"), prototype(name = NA_character_, age = NA_real_)) hadley <- new("Person", name =…
Jeremy Leipzig
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R: How to truly remove an S4 slot from an S4 object (Solution attached!)

Let's say I define an S4 class 'foo' with two slots 'a' and 'b', and define an object x of class 'foo', setClass(Class = 'foo', slots = c( a = 'numeric', b = 'character' )) x <- new('foo', a = rnorm(1e3L), b = rep('A', times =…
tingtingzhan
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Is it possible to have an S3 slot in an S4 class?

I'm wondering how to include an S3 object as a data member in an S4 object, i.e. using composition instead of inheritance. Here's my code snippet. library(randomForest) set.seed(1337) setClass("TestManager", slots = c( hp = "numeric", rfObj…
biubiuty
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How do you get S3 methods to work with S4 objects?

I'm writing an S3 method that I want to work with any R object, including S4 objects. The first thing I don't understand is that S4 classes don't appear to derive from an S4 base class, so given f <- function(x) UseMethod("f") I can't just declare…
Richie Cotton
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General way to transform S4 object to dataframe (R)

I have a number of S4 objects with a variable number of slots and slotnames. The data in each slot is the same length. For example the S4 object peaks: > str(peaks) Formal class 'MassPeaks' [package "MALDIquant"] with 4 slots ..@ snr : num…
R Greg Stacey
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Saving S4 objects in a list of list

R is giving the following message error when you want to save an S4 object into a list of list and the element was not already defined previously. "invalid type/length (S4/0) in vector allocation" Why is it working with a simple list, but not with a…
Arnaud
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S4 object with a pointer to a C struct

I have a third-party C library I am using to write an R extension. I am required to create a few structs defined in the library (and initialize them) I need to maintain them as part of an S4 object (think of these structs as defining to state of a…
pbhowmick
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How to define S4 method for taking the opposite of the object?

Let's say I have an S4 class called testClass. The contents are irrelevant the purpose of this question but let's make it contain a numeric value. #' An S4 class that stores a list. #' @export setClass("testClass", …
cdeterman
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