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Hello. This question concerns the Methods package. I have created a new class and am trying to set a method for it for S4 group generic "Summary". I have run into some signature problems. An example: > setClass("track", representation(x="numeric", y="character")) [1] "track" > setGeneric("max", group="Summary")

On the help page "DateTimeClasses {base}" it says: "One can add or subtract a number of seconds or a difftime object from a date-time object, but not add two date-time objects." However, > x<-Sys.time(); y<-Sys.time()+3600 > diff<-y-x > x; y; diff [1] "2005-11-23 19:58:20 GMT" [1] "2005-11-23 20:58:20 GMT" Time difference of 1 hours

...If instead of feeding the function X, I feed it unclass(X) or as.vector(X) the red color is not applied to the area between the first and last ticks on the x axis. Is this a bug, or just a consequence of there not being a plot method for the class I am trying to feed the function? Franklin Parlamis

the following returns an error in an 'exists' call on my machine MyEnv <- new.env() setClass("Numeric", "numeric", where=MyEnv) franklin parlamis > version _ platform powerpc-apple-darwin8.7.0 arch powerpc os darwin8.7.0 system powerpc, darwin8.7.0 status beta major 2 minor 4.0 year 2006 month 09 day 22 svn rev 39471 langua...

...tion(x) "Works") [1] "Math" > getGeneric("sqrt")(4) `__Deferred_Default_Marker__` the section in "How Methods Work" that deals with this is unfinished, but i think it suggests that getGeneric("sqrt")(4) should work out of the box. franklin parlamis > version _ platform powerpc-apple-darwin8.7.0 arch powerpc os darwin8.7.0 system powerpc, darwin8.7.0 status beta major 2 minor 4.0 year 2006 month 09 day 22 svn rev 39471 langua...

...ize on method writing. Will it matter on any level whether my virtual classes have NULL or S4 prototypes? On a related note, the behavior exhibited below also seems infelicitous setClass("kid4", contains = "mom") new("kid4") # error in the show method franklin parlamis

...ic", y = "missing"), function(x, y) "Special2") foo(1) # gives the group method foo2(1) # gives the default method selectMethod("foo2", signature(x = "numeric", y = "missing")) # but method selection appears to work correctly __ franklin parlamis > version platform powerpc-apple-darwin8.7.0 arch powerpc os darwin8.7.0 system powerpc, darwin8.7.0 status major 2 minor 4.0 year 2006 month 10 day 03 svn rev 39566 language R version.string R ve...

...ad analogous slots would appear in any formal objects that extend basic data types (like the Dim and Dimnames attributes in the 'Matrix' mother class from the Matrix package). Is that true? Are attributes un-S4? Any and all style advice or examples would be appreciated. Franklin Parlamis

...ndardGeneric("foo3")}, useAsDefault = FALSE) setMethod("foo3", signature(x = "missing"), function(x = 3) x) setMethod("foo3", signature(x = "numeric"), function(x = 3) x^2) foo() # returns 3 foo2() # returns 1 foo3() # returns 4 ___ franklin parlamis

...ly-called coercion method. library(Matrix) test <- Matrix(1:4+0.1, nrow = 2, dimnames = list(letters[1:2], LETTERS[1:2])) test at Dimnames <- list(1:100) test direct slot access (without a validity check) seems an easily accessible loophole to S4 object "guarantees". franklin parlamis

...fund and am looking for someone to join me, essentially as the principal quant for a new San Francisco office. I've been very impressed with the posters on this list and am hopeful that some of you will consider submitting your resume for the position. The job announcement follows. Franklin Parlamis (My apologies for posting in both sig-finance and devel -- finance experience is not mandatory) *** Statistician/Programmer Sought for San Francisco Hedge Fund Office. Pine River Capital Management (with assets under management in excess of USD 750 million and offices in Minneapolis, London and...

...behavior would be: (i) if an error occurs, remove the '*tmp*' variable (ii) report the error as occurring in the original replacement call (rather than the '*tmp*' replacement, which may be confusing to those who haven't read the "R Language Definition") franklin parlamis > version _ platform powerpc-apple-darwin8.7.0 arch powerpc os darwin8.7.0 system powerpc, darwin8.7.0 status alpha major 2 minor 4.0 year 2006 month 09 day 06 svn rev 39158 langu...

...e total number of unknowns i am dealing with) that would somehow store scalars associated with all the possible combinations of variables? does that thought have a future? (please ignore this last question if i am not, as is often the case, making sense) thanks in advance for any help. franklin parlamis

...s a primitive function; methods can be defined, but the generic function is implicit, and cannot be changed. in: setGeneric("@") however, in this last warning message, R says "methods can be defined" so i am left with a ray of hope. is there some way to do this? franklin parlamis

Using the '@' operator, I am able to extract a 'names' attribute assigned to a formal object. However, I can not use the replacement form ('@<-') to assign that attribute. > setClass("foo", representation("numeric")) [1] "foo" > (new("foo", 1:4)->a) An object of class ?foo? [1] 1 2 3 4 > names(a) <-

the code below has me confused: setClassUnion("index", c("numeric", "character", "logical")) extends("numeric") # i don't see the class union library(Matrix) extends("numeric") # now i see the class union i am aware that the "Matrix" package separately defines the "index" class union. is it the case that

Hi everyone and thanks for being patient. I've used "!.foo"() et seq pro tem. Next problem: how to define "Summary" methods for brobs. ?max says 'max' and 'min' are generic functions: methods can be defined for them individually or via the 'Summary' group generic. For this to work properly, the arguments '...' should be