search for: makeactivebinding

Hi, I wanted a Q&D way to open a new graphics window but keep the focus in the console window (under Windows and the Rgui), so I wrote a line into my Rprofile.site file as follows: invisible(makeActiveBinding('newdev', function(...) dev.new(restoreConsole=T), .GlobalEnv)) (That is all on one line, incase the mailer re-parses it). This gives me a command "newdev" which does not require me to enter a pair of parentheses to execute it. This worked just fine so far as the command goes...

A while ago Luke Tierney remarked that the warning associated with 'makeActiveBinding'-- "saved workspaces with active bindings may not work properly when loaded into older versions of R"-- should probably be removed in R-devel. It's still cropping up *sporadically* with R-alpha of 3/4/2004, but not every time I call 'makeActiveBinding'. So, two questions:...

Hi, I stumbled upon a surprising behavior when using an active binding as a loop index variable in R 4.0.0. In contrast, the behavior observed in R 3.6.1 is in line with my expectations. Consider the code below: makeActiveBinding("i", function(value) { if (missing(value)) { x } else { print("set") x <<- value } }, globalenv()) i <- 1 # output "set" print(i) # output [1] 1 # Surprising behavior starts here: for(i in 2:3) print(i) # output [1] "set"...

A shorter reproducible example: example(makeActiveBinding) for (fred in 1:3) { 0 } ls() Both problems go away if you first do compiler::enableJIT(2) So looks like a bug in compiling the for loop. -Deepayan On Sat, May 23, 2020 at 5:45 PM Thomas Friedrichsmeier via R-devel <r-devel at r-project.org> wrote: > > Possibly just a symptom of th...

...zation - lose their active ness when reloaded: $ R [...] > f <- local( { + x <- 1 + function(v) { + if (missing(v)) + cat("get\n") + else { + cat("set\n") + x <<- v + } + x + } + }) > makeActiveBinding("fred", f, .GlobalEnv) > bindingIsActive("fred", .GlobalEnv) [1] TRUE > > q("yes") get get romain at naxos /tmp $ R [..] > fred [1] 1 > bindingIsActive("fred", .GlobalEnv) [1] FALSE Is this possible ? Is there any other hook to handle s...

Greeting R-devel, I find myself wanting to attach an active binding to an existing object in the global environment (R 2.12.2), but there doesn't seem to be an easy way to do this: > x = 5 > makeActiveBinding("x", function(d) "hi", .GlobalEnv) Error in makeActiveBinding("x", function(d) "hi", .GlobalEnv) : symbol already has a regular binding Now I can get around this with some fancy assignment, but this seems ugly and underhanded: > x = 5 > y = x > r...

Dear R gurus, I am trying to create a nicer API interface for some R modules I have written. Here, I heavily rely on S3 method dispatch mechanics and makeActiveBinding() function I have discovered that I apparently can't dispatch on function call operator (). While .Primitive("(") exists, which leads me to believe that things like x(...) are internally translated to .Primitive("(")(x, ...), I can't seem to do something like: x <...

Hi Everyone, is there the possibility in R to assign a variable to be an alias of another one? Example: x <- 17 # assign y to be an alias of x y # returns 17 x <- 4 y # returns 4 Daniel

The following code produces an error in current R-devel f <- function(value) { if(!missing(value)) 100 else 2 } e <- new.env() makeActiveBinding("x", f, e) eval(substitute(list(x)), e) The error, after calling 'eval' is Error in eval(expr, envir, enclos) : element 1 is empty; the part of the args list of 'list' being evaluated was: (x) It has something to do with the change in R_isMissing in revision r4...

Hi, I was wondering if this is expected behavior for active bindings in attached environments, or if this is a bug: > e <- new.env() > makeActiveBinding('x',function() 'foo',e) > ls(e) [1] "x" > attach(e) > search() [1] ".GlobalEnv" "e" "package:graphics" [4] "package:grDevices" "package:datasets" "package:utils" [7] "packa...

After a bunch of discussion in the core group, we have decided to deprecate the delay() function (which was introduced as "experimental" in R 0.50). This is the function that duplicates in R code the delayed evaluation mechanism (the promise) that's used in evaluating function arguments. The problem with delay() was that it was handled inconsistently (e.g. sometimes you would see

Possibly just a symptom of the earlier behavior, but I'll amend my example, below, with an even more disturbing observation: Am Sat, 23 May 2020 13:19:24 +0200 schrieb Thomas Friedrichsmeier via R-devel <r-devel at r-project.org>: [...] > Consider the code below: > > makeActiveBinding("i", > function(value) { > if (missing(value)) { > x > } else { > print("set") > x <<- value > } > }, globalenv()) > > i <- 1 # output "set" > print(i) # output [1] 1 > > # Surprising behavior starts...

Hello, Should active binding appear as such in ls.str. > makeActiveBinding( "xx", function(arg){ Sys.sleep(10) }, .GlobalEnv ) > ls.str() # takes 10 seconds xx : NULL What we see here is the result of the "setter" of the binding. I'm attaching a patch that prints this instead: > ls.str() xx : <active binding> Although a better be...

For some reason I want to let one data set in a package be known under two different names. Is that possible, and if so, how? I do not want to have two copies of the data set in the package. Thanks, G?ran -- G?ran Brostr?m Department of Statistics Ume? University SE-90187 Ume?, Sweden

Is there an analogue of common lisp "*" variable which contains the value of the last expression? E.g., in lisp: > (+ 1 2) 3 > * 3 I wish I could recover the value of the last expression without re-evaluating it. thanks -- Sam Steingold (http://sds.podval.org/) on Ubuntu 11.10 (oneiric) X 11.0.11004000 http://www.childpsy.net/ http://camera.org http://ffii.org

...in the active binding being called: > fx <- function(v) { + if (missing(v)) + cat("getting x1\n") + else { + cat("setting x1\n") + assign("x1", v, envir=globalenv()) + } + get("x1", envir=globalenv()) + } > makeActiveBinding("x", fx, globalenv()) NULL > x1 <- 3 > x getting x1 [1] 3 > exists("x", inherits=FALSE) getting x1 [1] TRUE > sessionInfo() R version 2.4.1 (2006-12-18) i386-pc-mingw32 locale: LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONE...

Given a<-"c(1,2,3,4,5)" How can  I evaluate the variable a to return a (numeric) vector comprising of 1,2,3,4,5? Thanks. [[alternative HTML version deleted]]

I've seen a number of issues with the loading of workspaces discussed previously, but here's another one... I simply can't load any saved workspace at all... Here's an example, starting with an empty workspace and creating a single variable "a". > a<-1:5 > save.image("a.Rdata") > rm(a) > load("a.Rdata") Error in function ()  : unused

Hi there, I''d like to choose between an "static" and "dynamic" access of a reference class field, say ''a''. myObj <- getRefClass("Blabla")$new() Static: myObj$a Dynamic: myObj$a.get() where the function retrieves the data from a database (or some other location), stores it to a buffer and

Hi, There is an object, ".Last.value" to which the result of the most recent evaluation is assigned. This is similar to "ans" in Matlab. In Matlab "ans" can be very useful and time-saving, but typing the larger R version is somewhat clunky and takes away from the usefulness. Is it possible to reassign '.Last.value' to something simpler, like