search for: chiefmurphi

When the 'by' function forms subsets, are the rows in the same order as they are in the original data frame? For example, I want to use 'by' to calculate cumulative sums of a value 'v' by date 'd' for different levels of a factor 'f': >

Hello: I am building R 2.15.1 from source on a Windows 7 machine with the x64 toolset, MixTeX, and InnoSetup per http://cran.r-project.org/bin/windows/Rtools/. I obtained the source for 2.15.1 via svn from https://svn.r-project.org/R/branches/R-2-15-branch/. This is my first try building R from source. The build seems to go far, then terminates with "undefined exports: .M.classEnv" from

Sirs: My validity function did not run when my class contains="matrix". But if I first define the class with contains="numeric", then define it again with contains="matrix", validity runs. Here's the session: > f <- function(object) "BAD CLASS" # force error to > setClass("A", contains="matrix", validity=f) [1]

R-Devel: I am trying to get an attribute of the first argument in a call to a function whose formal arguments consist of dots only and do something, e.g., call 'cbind', based on the attribute f<- function(...) {get first attribute; maybe or maybe not call 'cbind'} I thought of (ignoring "deparse.level" for the moment) f<-function(...) {x <-

Hello:I am trying to match the value 0.3 in the sequence seq(.2,.3). I get > 0.3 %in% seq(from=.2,to=.3) [1] FALSE Yet > 0.3 %in% c(.2,.3) [1] TRUE For arbitrary sequences, this "invisible .3" has been problematic. What is the best way to work around this? Thank you. Dan [[alternative HTML version deleted]]

I am a newbie package builder who successfully built a "Hello world" package but am now having trouble building a package with S4 functionality. I thought I would start by building a package consisting of just the first example under the setGeneric help page in a "fresh" 2.10.0 (windows) console (methods loaded at startup). The example: ## create a new generic function, with a

Nevermind, I figured out my problem after looking at the packS4 package. I didn't realize that package.skeleton would build invalid R code. The warning hints at that, but I interpreted the warning to mean that the package.skeleton-generated code should be *edited*, and none of my edits gave me a workable package. Now I realize that the S4-driven code from package.skeleton can simply be

Sirs: I understand that no one wanted to maintain the old Help, but one feature I used extensively -- as a newbie to R or to an unfamiliar package -- was the capability of searching for a word or phrase on the Help page itself. Ctrl-F/Command-F (Windows/mac) 'differently-phrased-capability' was a fast way to find out how to specify the arguments for a function call to accommodate a

Hello: I have written some an elementary S4 classes around a matrix to strengthen control of some key attributes. When I run a fairly elementary function ("f") on the matrix outside the class it runs instantaneously (elapsed system.time = 0) but when I setMethod "f" on myClass -- returning an instance of myClass -- it runs perceptibly slower (elapsed system.time = .06). I

Johann, Following up on Gabor's reply, the mondate package (new on CRAN last week) will accomplish your needs. >I'm trying to make an integer-backed quarter (as in fraction of year) >class, but I can't quite it to work. I want integer-backed so I don't >have to worry about floating-point effects when doing math, and so that >I can use it as in data.table. mondate

R-Devel: When I get the data part of an S4 class that contains="data.frame", it gives me a list, even when the "data.frame" is the S4 version: > d<-data.frame(x=1:3) > isS4(d) [1] FALSE # of course > dS4<-new("data.frame",d) > isS4(dS4) [1] TRUE # ok > class(dS4) [1] "data.frame"

Dear Development Group, In trying to answer the subject question myself, I found this thread initiated by Tony from five years ago: http://tolstoy.newcastle.edu.au/R/help/05/12/18169.html. I recently stumbled upon the following S4 answer to Tony's question: setClass("fooWfcn", representation(dat1="vector", dat2="vector",

Hello, 'factor' returns <NA> for my S4 object when the class is given an "as.character" method. Here is a minimal example: > setClass("foo", contains="numeric") > bar <- new("foo", 12) > factor(bar) [1] 12 Levels: 12 > setMethod("as.character", "foo", function(x) paste("x=", x@.Data)) [1]

I am trying to write S4 methods with "difftime" in the signature but am being "informed" (? not a warning or error) that "difftime" is not a class. Nevertheless, dispatch takes place. Should I simply ignore that "information"? Here is a toy example: > setClass("foo", contains = "Date") > setMethod("+", c("foo",

Dear Claudia: Your question has many layers. Technically speaking, when I do "2011-05-01 CEST" -"2011-04-01 CEST" I get: > "2011-05-01 CEST" -"2011-04-01 CEST" Error in "2011-05-01 CEST" - "2011-04-01 CEST" : non-numeric argument to binary operator As previous posters suggest, storing the date strings as Date objects works

I have a class that extends array and my method for "[" stops with an error: > setClass("A", contains="array") [1] "A" > setMethod("[", "A", function(x, i, j, ..., drop = TRUE) new("A", callNextMethod())) [1] "[" > a<-new("A",array(1:12,c(4,3,1))) > a An object of class "A" , , 1

I am using curve3d in the emdbook package to graph a gaussian copula density function generated via the copula package. Unfortunately, it appears that emdbook masks dmvnorm from the package mvtnorm in a way that prohibits copula from generating the gaussian copula. (Sounds very confusing!) For example, > library(copula) > f<-function(x,y) dcopula(normalCopula(0),c(x,y)) >

> x<-as.POSIXct("1970-1-1", tz="UTC")-.5 > y<-as.POSIXct("1970-1-1", tz="UTC")+.5 > x==y [1] FALSE # of course but x and y "appear" to be the same when formatted, even with extra precision: > format(x, format="%Y-%m-%d %H:%M:%OS2") [1] "1970-01-01 00:00:00.50" > format(y, format="%Y-%m-%d

Hi again, I must be misunderstanding something fundamental about how an S4 class stored in a data.frame can be persuaded to print according to a desired format. The help page says: format.data.frame formats the data frame column by column, applying the appropriate method of format for each column. Here is my class: > setClass("A",contains="character") [1] "A"

R-Devel-ers: I have an S4 method that simply formats an object: setGeneric("formatMe", function(x) standardGeneric("formatMe")) setMethod("formatMe", "ANY", function(x) format(x)) If I issue the above in an R session, then define an S4 class with its own format method, I get the desired result: > setClass("A",contains="numeric")