similar to: S4 classes that extend S3 classes

Dear R Programmers! After some time of using R I decided to work through John Chambers book "Programming with Data" to learn what these S4 classes are all about and how they work in R. (I regret not having picked up this rather fine book earlier!) I know from the documentation and the mailing archives that S4 in R is not 100% the book and that there are issues especially with

Hi all, this is my first post in R devel? sorry if I lost some of the guidelines. Anyway this is my problem: Version: 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: setOldClass("nls.lm") setClass ( Class="TestClass",

One of the changes some packages are noticing from the recent modifications to methods is warnings of "undefined classes" during installation when the package extends S3 classes or uses them as slots UNLESSS they have been declared in a setOldClass() call. The green book "strongly recommends" declaring S3 classs this way (pp 449-451). The warnings on undeclared classes

Hello, I am the maintainer of the stringkernels package and have come across a problem with using S3 objects in my S4 classes. Specifically, I have an S4 class with a slot that takes a text corpus as a list of character vectors. tm (version 0.5) saves corpora as lists with a class attribute of c("VCorpus", "Corpus", "list"). I don't actually need the

>>>>> Herv? Pag?s <hpages at fredhutch.org> >>>>> on Tue, 12 May 2015 15:18:42 -0700 writes: > Hi, > The man page for new() suggests that if 'a' is an object with slots > "slot1" and "slot2" and C is a class that extends the class of 'a', > then the 2 following calls should be equivalent: >

Hi, I realize this is an old thread, but just wondering whether a conclusion was ever reached on this issue? I'm using formula(NULL) but it would be nice if default initialization worked for formula classes as well. Cheers, Josh On Thu, May 14, 2015 at 8:13 AM, Herv? Pag?s <hpages at fredhutch.org> wrote: > Thanks Martin for looking into this. H. > > > On 05/13/2015

>>>>> Joshua Wiley <jwiley.psych at gmail.com> >>>>> on Thu, 8 Oct 2015 12:19:16 +1100 writes: > Hi, I realize this is an old thread, but just wondering > whether a conclusion was ever reached on this issue? I'm > using formula(NULL) but it would be nice if default > initialization worked for formula classes as well. Well,

Thanks Martin for looking into this. H. On 05/13/2015 03:57 AM, Martin Maechler wrote: >>>>>> Herv? Pag?s <hpages at fredhutch.org> >>>>>> on Tue, 12 May 2015 15:18:42 -0700 writes: > >> Hi, > >> The man page for new() suggests that if 'a' is an object with slots >> "slot1" and "slot2" and C is a

Hi, The man page for new() suggests that if 'a' is an object with slots "slot1" and "slot2" and C is a class that extends the class of 'a', then the 2 following calls should be equivalent: new("C", a, ...) new("C", slot1=a at slot1, slot2=a at slot2, ...) This is generally the case but I just ran into a situation where it's not.

Hello, I'm trying to get S4 dispatch on S3 "connection" objects. So I do : setOldClass( "connection" ) and then : setGeneric( "bling", function(object) standardGeneric( "bling" ) ) setMethod( "bling", "connection", function(object) cat( "gotcha ", as.integer(object), "\n" ) ) but I get : f <- file(

Two recent changes have been committed to r-devel, related to discussions on this list earlier: 1. setOldClass() has an argument prototype= to specify the default object for the class. If provided, the S3 class can be a slot in an S4 class, with a valid default object. (It's still not going to work well to have an S3 non-virtual class as a superclass of an S4 class. See the

A general goal for the next version of R is to make S4 and S3 play better together. As mentioned in a previous thread, one limitation has been that S3 generic functions, specifically the UseMethod() call, did not make use of S4 inheritance when dispatching on general S4 objects. This has been fixed in a version committed today (updated to rev 52267). The code change is not large, but it

The is() function begins with the following code: cl <- class(object) if (length(cl) > 1) { if (is.na(match(cl[[1]], names(getClass("oldClass")@subclasses)))) return(class2 %in% cl) As one can see, it uses S3 inheritance if the first element of the class attribute is an "oldClass". In R prior to 2.7, is() would check S4 inheritance if any

Bug fix: A bug introduced in version 1.6 failed to "initialize" some old-style (aka "S3") classes, producing possible warning messages if those classes were used in the signature of a method in the methods package. The real bug, though, was that old-style inheritance could not be included, until the setOldClass function was provided. Initializing the methods package now

Hi all, I'm trying to implement the matrix multiplication operator, which is S4 generic, for an old-style S3 class. The following works as expected: x <- 1:10 class(x) <- "myClass" setOldClass("myClass") setGeneric("myMethod", function(x, y) standardGeneric("myMethod")) setMethod("myMethod", c("myClass", "myClass"),

The %*% function is a primitive. As it says in the documentation under ?Methods_Details Methods may be defined for most primitives, and corresponding metadata objects will be created to store them. Calls to the primitive still go directly to the C code, which will sometimes check for applicable methods. The definition of ?sometimes? is that methods must have been detected

Full_Name: Cesar Telmo Costa Version: R version 2.9.2 (2009-08-24) OS: Ubuntu kermic Submission from: (NULL) (85.241.174.237) AFTER install.packages("tm"): downloaded 317 Kb * Installing *source* package ?tm? ... ** libs gcc -std=gnu99 -I/usr/share/R/include -fpic -g -O2 -c lazyTmMap.c -o lazyTmMap.o gcc -std=gnu99 -shared -o tm.so lazyTmMap.o -L/usr/lib/R/lib -lR ** R ** data

I've rolled up R-2.8.0.tar.gz a short while ago. This is a development release which contains a number of new features. Also, a number of mostly minor bugs have been fixed. See the full list of changes below. You can get it (later today) from http://cran.r-project.org/src/base/R-2/R-2.8.0.tar.gz or wait for it to be mirrored at a CRAN site nearer to you. In case of impatience, try

I've rolled up R-2.8.0.tar.gz a short while ago. This is a development release which contains a number of new features. Also, a number of mostly minor bugs have been fixed. See the full list of changes below. You can get it (later today) from http://cran.r-project.org/src/base/R-2/R-2.8.0.tar.gz or wait for it to be mirrored at a CRAN site nearer to you. In case of impatience, try

On 05/28/2015 02:49 AM, Julien Id? wrote: > Hey everyone, > > I would like to develop a package using S4 classes. > I have to define several S4 classes that inherits from each others as > follow: > > # A <- B <- C <- D > > I also would like to define .DollarNames methods for these class so, if I > have understood well, I also have to define an old class as