similar to: Problem calling $ inside a $ method

Hi, Given a simple three class hierarchy: A <-- B <-- C I want to define an initialize method for each class such that when I call new("C", x=5), the initialize methods for A and B are used to incrementally build the object. When I do what seems obvious to me using callNextMethod, I get an infinite recursion. An example follows... setClass("A",

Hi all, I would like to access the name of a variable passed to an S4 method. For a function, I would do this: f <- function(x) as.character(substitute(x)) This also works for a the examples I have tried for methods that do not have extra, non-dispatch args: setGeneric("A", function(x, ...) standardGeneric("A")) setMethod("A",

showMethods isn't reporting inherited methods when it is first called. The methods are there and after calling them, showMethods gives the right output. Here is an example (using R-devel r39647): setClass("A", representation(x="numeric"), prototype=list(x=1)) setClass("B", contains="A", prototype=list(x=2))

Hi, after updating R 2.5.0 devel yesterday we today observed many new unexpected failures in our daily package build and test system runs, which can be traced to recent changes in the implementation in try() (as noted in NEWS). Investigating this new implementation I come across an issue in conjuntion with using S4 classes and methods. try(expr) does not return an object with attribute

Dear all, I have a question regarding setIs and method dispatch in S4 classes: Consider the following example: ##################################################### ## A02 "contains" A01 by setIs: setClass("A01", representation(a="numeric",b="numeric")) setClass("A02", representation(a="numeric",d="numeric"))

Hi, Using latest R 2.5.0 Patched, I'm unable to install the Matrix package from cran.fhcrc.org. I get: Creating a new generic function for "isSymmetric" in "Matrix" Creating a new generic function for "unname" in "Matrix" Error in conformMethod(signature, mnames, fnames, f) : In method for function "!": formal arguments omitted in

Is it possible to override S4 methods in an installed package? The naive library("pkg") setMethod("foo", signature(obj = "bar"), function(obj , x, y) { new definition } , where="package:pkg") results in the error Error in setMethod("foo", signature(obj = "bar"), function(obj, : the environment "pkg" is

Hello all, An S4 class that contains matrix can be converted into a matrix using as(). When the resulting object is printed implicitly at the command line, all is well. When print() is explicitly called, I see an infinite recursion. Here is an example: ## create a subclass of matrix > setClass("Foo", representation(name="character"), contains="matrix")

I am new to using S4 methods and have run into this problem (on Windows XP using R 2.4.1): I am writing a package in which I use the graph package. I define my own classes of graphs as: setOldClass("graphsh") setOldClass("ugsh") setIs("ugsh", "graphsh") (I know that I "should have" used setClass instead - and I will eventually - but right now

Dear John and Seth, dear R-devels, once again the question of method dispatch in S4 -- this time with setClassUnion(); taking up your advice in https://stat.ethz.ch/pipermail/r-devel/2006-April/037200.html https://stat.ethz.ch/pipermail/r-devel/2006-April/037201.html I have been too quick in stating that >setClassUnion()---at least in my case---solves the problem; > The problem arises

Hi, I have a S3 package with namespace called "myS3Pkg". Inside my package I would like to create a S4 class which extends (adds 2 slots) another S4 class from some other package. The class should be created in "myPkg" environment (and not global environment). Using: setClass("myS4class", representation("otherS4class", mydata = "numeric"),

Hi all, One of the things I find most problematic in R is the partial matching of names in lists. Robert and I have discussed this and we believe that having a mechanism that does not do partial matching would be of significant benefit to R programmers. To that end, I have written a patch that modifies the behavior of "[[" as follows: 1. [[ gains an 'exact' argument with

Is there a way to rename a function when importing it? I want to say, "import yourFunc from Foo as myFunc" in the NAMESPACE file. Does this exist and I've missed it? If it doesn't exist, would others think it useful (and possible)? Best, + seth

promptClass fails to identify methods associated with the class. Here is a fix: Index: promptClass.R =================================================================== --- promptClass.R (revision 41719) +++ promptClass.R (working copy) @@ -165,7 +165,7 @@ if (nmeths > 0) { .meths.body <- " \\describe{" for (i in 1:nmeths) { - .sigmat

Should functions or the user be responsible for coercing an S4 object argument containing the proper object (and thus should below be considered a bug in the packages or not)? The example is with RSQLite but the same thing happens with RMySQL, and other DBI packages. > library("RSQLite") Loading required package: DBI > m <- dbDriver("SQLite") > con <-

I have a small S4 class for which I've written a page grouping many of the accessors and replacement functions together. I would be interested in people comments on the approach I've taken. The code has a couple of decisions for which I could imagine alternatives. First, even simple get/set operations on class elements are wrapped in functions. I suppose I could just use myinstance at

Hi all, The dict package provides a dictionary (hashtable) data structure much like R's built-in environment objects, but with the following differences: - The Dict class can be subclassed. - Four different hashing functions are implemented and the user can specify which to use when creating an instance. I'm sending this here as opposed to R-packages because this package will

The default initialization for slots of class "factor" and "data.frame" gives NULL. This seems odd, since those slots can't ever be set to NULL by the user. I would expect zero-length instances of factor and data.frame. Here is an example: setClass("FOO", representation(a="factor", b="data.frame", c="numeric")) [1] "FOO"

Hi, I would be nice if names() returned the equivalent of ls() for environments. --- a/src/main/attrib.c +++ b/src/main/attrib.c @@ -687,6 +687,8 @@ SEXP attribute_hidden do_names(SEXP call s = CAR(args); if (isVector(s) || isList(s) || isLanguage(s)) return getAttrib(s, R_NamesSymbol); + if (isEnvironment(s)) + return R_lsInternal(s, 0); return R_NilValue; }

I'm looking for ideas for creating high-quality plots for use in projected presentations (powerpoint, etc) --- ideally high-quality png, jpg, bmp. The graphics produced using the postscript device look very good. Those generated with win.graph(), png are plagued by the jaggy lines. So far, the only way I can use the postscript plots in my presentations is using separate screen capture