On Thu, 2006-06-08 at 11:54 -0400, Manuel Morales wrote: > On Wed, 2006-06-07 at 21:36 +0100, Prof Brian Ripley wrote: > > I suggest you investigate with().
Thanks for the suggestion! Unfortunately, it's not clear to me how to call with() from a function. The example below fails with the error message: 'Error in mean(x) : object "a" not found' data.test <- data.frame(a=c(1:10),b=rnorm(10)) eg.function <- function(x, data) with(data, return(mean(x))) eg.function(a,data.test) Manuel > Thanks! Just to be sure, the following will do what I want? > > eg.function <- function(x, data=NULL, subset=NULL, ...) { > with(if(is.null(subset)) data else subset(data,subset), { > > ... > > }) > } > > > On Wed, 7 Jun 2006, Manuel Morales wrote: > > > > > Dear list members, > > > > > > In some of my functions, I attach the data internally to allow subset > > > commands or to specify a data frame. This works well except for cases > > > where there is a "masking" conflict (which returns a warning). I see > > > some alternative listed in ?attach, but I'm not sure which of them do > > > what I'd like. Any suggestions? > > > > > > Below is how I've been setting up my functions: > > > > > > > > > > > > # Set up environment > > > on.exit(detach(data)) > > > attach(data) > > > if(!is.null(subset)) { > > > data<-subset(data,subset) > > > detach(data) > > > attach(data) > > > } > > > subset = NULL > > > > > > # Function body here > > > output <- x > > > return(output) > > > } > > > > > > Thanks! > > > > > > Manuel > > > > > > ______________________________________________ > > > R-help@stat.math.ethz.ch mailing list > > > https://stat.ethz.ch/mailman/listinfo/r-help > > > PLEASE do read the posting guide! > > > http://www.R-project.org/posting-guide.html > > > > > > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html