search for: referenceclass

Dear help, dear John Chambers, I'm trying to learn OOP-possibilities in R and I was going through the documentation 'ReferenceClasses {methods}'. (great work, by the way...) Reading associated Examples, something bothers me : it seems to me that there are errors in 'edit' and 'undo' methods. I think that : - 'undo' should update 'edits' field with : length(edits) <<- length(edits) - 1...

Dear r-devel-list, dear John Chambers, I'm trying to learn OOP-possibilities in R and I was going through the documentation 'ReferenceClasses {methods}' (great work, by the way...). Reading associated Examples, something bothers me : it seems to me that there are errors in 'edit' and 'undo' methods. I think that : - 'undo' should update 'edits' field with : length(edits) <<- length(edits) - 1...

...tyle is now: mEdit <- setRefClass("mEdit",......) xx <- mEdit(data = xMat) instead of xx <- mEdit$new(data = xMat) The returned object still has fields and methods accessible as before. See the "Value" and "Reference Class Generators" sections of ?ReferenceClasses for details. Thanks to Romain Fran?ois for suggesting this. John

...e assignments. The getters and setters ("$", "[") are set up and work. Each modification goes in hand with assigning new values to bar as well as updating the FOO object through available setters from FOO. So far, this way has brought me to about 100 lines, but now I read about ReferenceClasses and was wondering, if there is a much easier way of achieving my goals. Moreover, I was not sure any longer if my goals make sense or if a more advanced programmer would do it totally different (and could share some structural thinking on their approach). The idea behind my way of doing was base...

How do you debug methods of a reference class? I've been using mtrace, which is excellent, but i cannot figure out how to mtrace a reference class method. Maybe there is some other way to debug these, for example with ordinary trace? for now i am only able to use options(error=recover), which is not giving me idea where exactly in the code i am once i am stopped on an error. -- View this

...g (r-devel at r-project.org) Betreff: Reference classes: error with missing arguments in method calls Dear list, I?m having problems in understanding an error that pops up in the context of missing arguments with methods of reference class objects. Because of the following statement taken from ??referenceClass?, my ref class methods call explicit S4 methods: ?Reference methods should be kept simple; if they need to do some specialized R computation, that computation should use a separate R function that is called from the reference method? So a ref class would look like this: setRefClass(Class="Xmp...

...hellesoy/cucumber/). I have used what I think works for R, and abandoned what doesn't, creating a testing environment that is philosophically centred in R. Version 0.6 ------------------------------------------------------------------------------ * All `mutatr` classes have been replaced with ReferenceClasses. * Better documentation for short-hand expectations. * `test_dir` and `test_package` gain new `filter` argument which allows you to restrict which tests are run. -- Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice University http://had.co.nz/ ___________...

...hellesoy/cucumber/). I have used what I think works for R, and abandoned what doesn't, creating a testing environment that is philosophically centred in R. Version 0.6 ------------------------------------------------------------------------------ * All `mutatr` classes have been replaced with ReferenceClasses. * Better documentation for short-hand expectations. * `test_dir` and `test_package` gain new `filter` argument which allows you to restrict which tests are run. -- Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice University http://had.co.nz/ ___________...

Dear list, is there a shortcut-function to check whether a class is a Reference Class or not? There's something like this for S4 classes ('isS4(object)'), but I couldn't find anything regarding Ref Classes. Currently, I'm doing it this way, which is a bit clumsy: A <- setRefClass("A", fields=list(X="numeric")) a <- A$new() isRefClass <-

Hello everybody, please excuse my bad English. I am Alfredo Naime and I'm from to Venezuela. I want to make a lib with tools for simulation (queues, inventories, factory, etc.) using object-oriented programming (OOP). You have any manuals on the handling of data types, classes, inheritance, etc. in R with examples and how to make a R lib. Thank you, very much. Alfredo

Is there a simple way to assign values to S4 slots from within a function? Doing this doesn't work: > assign_slot<-function(x){ assign("OBJECT at slot",x,envir=parent.env(environment()) } >assign_slot(x) All I get from this is a new object with the name OBJECT at slot, the slot assignment of OBJECT doesn't change. I have thought about solutions such as

Hi list, is there a way to define some kind of private Variable? I would like to prevent the user from manipulating fields on his own, in order to not destroy data structures. The problem is, that as soon as the variable exists in the environment it is accessible via t$secret_value. test <- setRefClass("test", fields=list( secret = function(value){ cat("the function was

Apologies for asking something that is probably very obvious, i just started with S4 classes and i guess i am not finding documentation that lays out the grammar rules and gives enough examples. I understand that main method of writing a member function is to write a generic function and setMethod for this particular class. This, however, presumes that there is "virtuality" for this

Dear list, I'm having problems in understanding an error that pops up in the context of missing arguments with methods of reference class objects. Because of the following statement taken from '?referenceClass', my ref class methods call explicit S4 methods: "Reference methods should be kept simple; if they need to do some specialized R computation, that computation should use a separate R function that is called from the reference method" So a ref class would look like this: setRefCl...

Dear R-users, I am working on a project that uses S4-classes. At some point I encountered the problem - well known to R - that I have to pass 3 different objects to a function, that should modify several slots of them and of course there is no passing by reference in R. Then I read this thread by Steve Lianoglou: https://stat.ethz.ch/pipermail/r-help/2010-August/250468.html, which offers from

Hello Everyone! Here are a couple of thought/questions on refClasses integration in R core functionality. First, coexistence with S4: > X <- setRefClass("classX", fields = c("a", "b"), + representation = list(c = "character")) > x <- X$new() > x at c <- "sss" > x An object of class "classX"

Apologies for asking something that is probably super obvious, i just started with S4 classes and i guess i am not finding documentation that layout the grammar rules and give enough examples. Some questions i am having are these 1. I understand that main method of writing a member function is to write a generic function and setMethod for this particular object. This, however, presumes that there

...able on all builds of R. ? Sys.which() has been altered to return "" if the command is not found (even on Solaris). ? A facility for defining reference-based S4 classes (in the OOP style of Java, C++, etc.) has been added experimentally to package methods; see ?ReferenceClasses. ? The predict method for "loess" fits gains an na.action argument which defaults to na.pass rather than the previous default of na.omit. Predictions from "loess" fits are now named from the row names of newdata. ? Parsing errors detected dur...

...able on all builds of R. ? Sys.which() has been altered to return "" if the command is not found (even on Solaris). ? A facility for defining reference-based S4 classes (in the OOP style of Java, C++, etc.) has been added experimentally to package methods; see ?ReferenceClasses. ? The predict method for "loess" fits gains an na.action argument which defaults to na.pass rather than the previous default of na.omit. Predictions from "loess" fits are now named from the row names of newdata. ? Parsing errors detected dur...

Hello! I am optimizing my code in R and for this I need to know a bit more about the internals. It would help tremendously if someone could link me to a page with O()-complexities of all the operations. In this particular case, I need something like a linked list with O(1) insertLast/First ability. I can't preallocate a vector since I do not know the final size of the list ahead of time. The