similar to: Learning S3

Dear R People: Could someone direct me to some documentation on the difference between S3 and S4 classes, please? For example, why would a person use one as opposed to another? Maybe pros and cons of each? Thanks in advance! R Version 2.2.0 (I'm downloading the new one this afternoon!) Windows. Happy New Year! Sincerely, Erin Hodgess Associate Professor Department of Computer and

R offers a bewildering array of options when it comes to representing dates and times (e.g, as.Date, chron, strptime, zoo, etc). Can anybody recommend a document that compares the relative merit of each method? I'm not looking for help with any one method, but rather a guide that describes which method is best for a particular data analysis/plotting goal. Thanks, Jake [[alternative

Hi. I frequently convert date and time data to and from character representations. I'm frustrated with chron, because 'seconds' are required to create a time object (my input data never has seconds). More importantly, I cannot make chron print the format 12/30/2006 (which my output data requires). I really like the format flexibility of strftime() and strptime(), but of course

Full_Name: Bo Zhou Version: 2.6.1 (2007-11-26) OS: Windows XP Submission from: (NULL) (207.237.54.242) Hi, I found an arithmetic problem when I'm doing something with POSIXct The code to reproduce it is as follows (This is the recommended way of finding out time zone difference on R News 2004-1 Page 32 URL http://cran.r-project.org/doc/Rnews/Rnews_2004-1.pdf) a=Sys.time()

violating.runs I read from the news cran.r-project.org/doc/Rnews/Rnews_2004-1.pdf that the criteria for the violating is 5 but 1)I cannot find "5" in the code of the function. Where is the "5" ? 2)What is the easiest way to change it ? 3)Is there any more criterias made somewhere ? Yours sincerelly, Tommi Viitanen

You might find http://adv-r.hadley.nz/s3.html to be helpful (in particular, http://adv-r.hadley.nz/s3.html#constructors-1, gives my advice about subclass constructors) Hadley On Mon, Aug 7, 2017 at 7:06 PM, Kym Nitschke <kym.nitschke at icloud.com> wrote: > Hi R Users, > > I am relatively new to programming in R ? so I apologise if my questions appear ?dumb?. > > I am using

Hi R Users, I am relatively new to programming in R ? so I apologise if my questions appear ?dumb?. I am using a package that defines a number of S3 classes. I want to create an S3 child class of one of these classes. The parent class has a contractor with many arguments. I have been having difficulty writing the child class contractor. I have been unable to find a good reference in the internet

Dear all, For an open-source project that I'm working on (1), which uses R for all its heavy lifting but includes a wrapper shell script, I was hoping to find a way to capture all warnings (and, in fact, errors too), and handle them in my own way. I realise I can do this for a single expression using something like: > f <- function(w) print(w$message) >

Full_Name: Mario Luoni Version: 2.10.0 OS: Windows XP HE SP3 Submission from: (NULL) (217.194.59.134) This piece of code: zzz1 <- as.POSIXct("1999-03-18", tz="CET") zzz2 <- as.POSIXlt("1999-03-18", tz="CET") zzz1 == zzz2 as.Date(zzz1) as.Date(zzz2) yields TRUE for "zzz1==zzz2", but the two dates returned by as.Date are different: >

Hi, I'm experiencing a problem with strptime. (R 1.9.1 on a Win2000 machine) I have a large list containing 6 columns and 161800 rows. One column contains dates that I want to convert in order to compare the different dates. Some dates work just fine while others become NA. I don't see any difference between the dates. I've attached an example from my code. Hope this explains my

Hi all, Because str uses the generic version of length and names, it's currently very easy to create objects that break str: a <- structure(list(1:5), class = "a") length.a <- function(x) 2L str(a) b <- structure(list(1:5), class = "b") names.b <- function(x) character() str(b) These are obvious toy examples, but it is a real problem if you want to create

Hi all, The profr package provides a method for displaying its output with ggplot: ggplot.print. You don't need this ggplot2 to use profr, so ggplot2 is listed under enhances in the DESCRIPTION file. If I have just S3method(ggplot, profr) in my NAMESPACE, then I get: ** testing if installed package can be loaded Error : object 'ggplot' not found whilst loading namespace

Does it make sense to be able to load an S4 object without the methods package being attached? I'm not sure implementation-wise how easy this would be, but it seems like any time there is an S4 object around, the methods package should be available to deal with it. ~G On Tue, Apr 19, 2016 at 7:34 AM, Michael Lawrence <lawrence.michael at gene.com > wrote: > Right,

Hi Gabor and everybody; Thanks Gabor, with the alternative step you've told me the problem is resolved. Comparing the two procedures: Extract from the source 'character' data: > rain$ts[2039:2046] [1] "25/03/2000 22:00:00 UTC" "25/03/2000 23:00:00 UTC" [3] "26/03/2000 00:00:00 UTC" "26/03/2000 01:00:00 UTC" [5] "26/03/2000 02:00:00

Y para completar, también existen las reference class o las más modernas R6. https://adv-r.hadley.nz/r6.html Que se parecen más a los lenguajes más orientados a objetos, con sus herencias y demás historias. dom., 9 dic. 2018 17:23, Carlos J. Gil Bellosta <cgb en datanalytics.com> escribió: > Hola, ¿qué tal? > > S3 es un sistema de clases bastante primitivo. Está pensado

Hola Carlos, Muchas gracias por el enlace, me ha sido de gran ayuda. Ya he entendido cómo funciona el sistema S3. Un saludo, Guillermo > Hola, ¿qué tal? > > Sigue http://www.datanalytics.com/2011/08/04/desarrollo-de-paquetes-con-r-iv-funciones-genericas/ > a rajatabla y lo tendrás. > > Un saludo, > > Carlos J. Gil Bellosta > http://www.datanalytics.com > >

Dear Martin, What's the ETA for _R_CLASS_MATRIX_ARRAY_=TRUE to become the new unconditional behavior in R devel? Thanks! H. On 11/21/19 08:57, Martin Maechler wrote: > > TLDR: This is quite technical, still somewhat important: > 1) R 4.0.0 will become a bit more coherent: a matrix is an array > 2) Your package (or one you use) may be affected. > >

Dear List, In one of my packages I have an S3 method for the plot3d generic function from package rgl. I am trying to streamline my Depends entries but don't know how to have plot3d(foo) in the examples section for the plot3d method in my package, without rgl being in Depends. Note that I importFrom(rgl, plotd3d) and register my S3 method via S3Method() in the NAMESPACE. If rgl is not in

Hello, I have large zoo objects (about 100 or more time series merged next to eachother). Example: X05.Oct.99 X05.Nov.99 X05.Dec.99 X05.Jan.00 X05.Feb.00 X05.Mar.00 X05.Apr.00 X05.May.00 X05.Jun.00 [1,] 5649.3 5679.4 5679.4 5679.4 5679.4 5679.4 5679.4 5679.4 5679.4 [2,] 5682.7 5719.2 5719.2 5719.2 5719.2 5719.2 5719.2

Buenas Desde hace ya bastante tiempo veo viendo que hay diferentes tipos de clases en R, las mas viejas, S3, y luego algunas mas modernas como S4,... ?Que diferencias existen entre estas clases? Alguna buena referencia la respecto, que sea entendible por un profano de la informatica?= Gracias Jes?s [[alternative HTML version deleted]]